feat(language): add Erlang programming language support (@Ryrden) (#7013)

### Description

This PR adds support for the Erlang programming language to Monkeytype,
providing developers with a comprehensive set of essential Erlang
keywords, OTP behaviors, and standard library functions for typing
practice.

**Changes made:**
- Add `code_erlang` to language schema
(`packages/schemas/src/languages.ts`)
- Add `code_erlang` to frontend constants in the `code` language group
(`frontend/src/ts/constants/languages.ts`)
- Create `code_erlang.json` with 245 essential Erlang keywords and
functions
- Includes core language constructs (after, and, case, receive, spawn),
OTP behaviors (gen_server, supervisor, application), built-in functions
(spawn_link, monitor, register), and standard library modules (lists,
string, ets, mnesia, file, io)

### Checks

- [ ] Adding quotes?
- [ ] Make sure to include translations for the quotes in the
description (or another comment) so we can verify their content.
- [x] Adding a language?
- Make sure to follow the [languages
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/LANGUAGES.md)
  - [x] Add language to `packages/schemas/src/languages.ts`
- [x] Add language to exactly one group in
`frontend/src/ts/constants/languages.ts`
  - [x] Add language json file to `frontend/static/languages` 
- [ ] Adding a theme?
- Make sure to follow the [themes
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/THEMES.md)
  - [ ] Add theme to `packages/schemas/src/themes.ts`
  - [ ] Add theme to `frontend/src/ts/constants/themes.ts`
  - [ ] Add theme css file to `frontend/static/themes`
- [ ] Add some screenshot of the theme, especially with different test
settings (colorful, flip colors) to your pull request
- [ ] Adding a layout?
- [ ] Make sure to follow the [layouts
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/LAYOUTS.md)
  - [ ] Add layout to `packages/schemas/src/layouts.ts`
  - [ ] Add layout json file to `frontend/static/layouts` 
- [ ] Adding a font?
- Make sure to follow the [themes
documentation](https://github.com/monkeytypegame/monkeytype/blob/master/docs/FONTS.md)
  - [ ] Add font file  to `frontend/static/webfonts`
  - [ ] Add font to `packages/schemas/src/fonts.ts`
  - [ ] Add font to `frontend/src/ts/constants/fonts.ts`
- [x] Check if any open issues are related to this PR; if so, be sure to
tag them below.
- [x] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [x] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

<!-- No related issues found -->

Note: Please, is it possible to add the label `hacktoberfest-accepted`
to this PR?

Co-authored-by: Jack <jack@monkeytype.com>

frontend/src/ts/constants/languages.ts

@@ -353,6 +353,7 @@ export const LanguageGroups: Record<string, Language[]> = {
     "code_cobol",
     "code_clojure",
     "code_common_lisp",
+    "code_erlang",
     "code_ocaml",
     "code_odin",
     "code_fortran",

frontend/static/languages/code_erlang.json

@@ -0,0 +1,251 @@
+{
+  "name": "code_erlang",
+  "noLazyMode": true,
+  "words": [
+    "after",
+    "and",
+    "andalso",
+    "band",
+    "begin",
+    "bnot",
+    "bor",
+    "bsl",
+    "bsr",
+    "bxor",
+    "case",
+    "catch",
+    "cond",
+    "div",
+    "end",
+    "fun",
+    "if",
+    "let",
+    "not",
+    "of",
+    "or",
+    "orelse",
+    "query",
+    "receive",
+    "rem",
+    "try",
+    "when",
+    "xor",
+    "module",
+    "export",
+    "import",
+    "compile",
+    "vsn",
+    "author",
+    "behaviour",
+    "behavior",
+    "record",
+    "define",
+    "ifdef",
+    "ifndef",
+    "else",
+    "endif",
+    "include",
+    "include_lib",
+    "undef",
+    "spec",
+    "type",
+    "opaque",
+    "callback",
+    "optional_callbacks",
+    "spawn",
+    "spawn_link",
+    "spawn_monitor",
+    "spawn_opt",
+    "link",
+    "unlink",
+    "monitor",
+    "demonitor",
+    "process_flag",
+    "register",
+    "unregister",
+    "whereis",
+    "registered",
+    "send",
+    "exit",
+    "throw",
+    "error",
+    "apply",
+    "make_ref",
+    "node",
+    "nodes",
+    "self",
+    "pid_to_list",
+    "list_to_pid",
+    "atom_to_list",
+    "list_to_atom",
+    "binary_to_list",
+    "list_to_binary",
+    "term_to_binary",
+    "binary_to_term",
+    "integer_to_list",
+    "list_to_integer",
+    "float_to_list",
+    "list_to_float",
+    "tuple_to_list",
+    "list_to_tuple",
+    "size",
+    "byte_size",
+    "bit_size",
+    "length",
+    "hd",
+    "tl",
+    "element",
+    "setelement",
+    "tuple_size",
+    "is_atom",
+    "is_binary",
+    "is_bitstring",
+    "is_boolean",
+    "is_float",
+    "is_function",
+    "is_integer",
+    "is_list",
+    "is_number",
+    "is_pid",
+    "is_port",
+    "is_record",
+    "is_reference",
+    "is_tuple",
+    "abs",
+    "round",
+    "trunc",
+    "max",
+    "min",
+    "gen_server",
+    "gen_statem",
+    "gen_fsm",
+    "gen_event",
+    "supervisor",
+    "application",
+    "start",
+    "stop",
+    "init",
+    "handle_call",
+    "handle_cast",
+    "handle_info",
+    "terminate",
+    "code_change",
+    "start_link",
+    "call",
+    "cast",
+    "reply",
+    "noreply",
+    "normal",
+    "shutdown",
+    "brutal_kill",
+    "permanent",
+    "temporary",
+    "transient",
+    "worker",
+    "one_for_one",
+    "one_for_all",
+    "rest_for_one",
+    "simple_one_for_one",
+    "infinity",
+    "timer",
+    "sleep",
+    "send_after",
+    "send_interval",
+    "cancel",
+    "now",
+    "date",
+    "time",
+    "localtime",
+    "universaltime",
+    "calendar",
+    "datetime_to_gregorian_seconds",
+    "gregorian_seconds_to_datetime",
+    "erlang",
+    "system_info",
+    "memory",
+    "garbage_collect",
+    "process_info",
+    "statistics",
+    "trace",
+    "trace_pattern",
+    "dbg",
+    "ets",
+    "new",
+    "insert",
+    "lookup",
+    "delete",
+    "match",
+    "select",
+    "foldl",
+    "foldr",
+    "tab2list",
+    "info",
+    "dets",
+    "open_file",
+    "close",
+    "sync",
+    "mnesia",
+    "create_schema",
+    "create_table",
+    "delete_table",
+    "write",
+    "read",
+    "transaction",
+    "activity",
+    "dirty_write",
+    "dirty_read",
+    "dirty_delete",
+    "file",
+    "open",
+    "position",
+    "consult",
+    "eval",
+    "script",
+    "io",
+    "format",
+    "fwrite",
+    "nl",
+    "get_line",
+    "get_chars",
+    "put_chars",
+    "lists",
+    "append",
+    "concat",
+    "reverse",
+    "sort",
+    "keysort",
+    "member",
+    "filter",
+    "map",
+    "foreach",
+    "all",
+    "any",
+    "partition",
+    "splitwith",
+    "takewhile",
+    "dropwhile",
+    "zip",
+    "unzip",
+    "flatten",
+    "string",
+    "len",
+    "equal",
+    "chr",
+    "str",
+    "rstr",
+    "span",
+    "cspan",
+    "substr",
+    "tokens",
+    "chars",
+    "copies",
+    "words",
+    "sub_word",
+    "strip",
+    "left",
+    "right",
+    "centre",
+    "to_upper",
+    "to_lower"
+  ]
+}

packages/schemas/src/languages.ts

@@ -418,6 +418,7 @@ export const LanguageSchema = z.enum(
     "code_cobol",
     "code_clojure",
     "code_common_lisp",
+    "code_erlang",
     "docker_file",
     "code_fortran",
     "viossa",