Summary:
We want to be able to benchmark initial sync, so this diff adds two
scripts. The first, drop-stuff.sh, drops all data from the app and sync
databases that isn't related to account credentials. The second,
benchmark-initial-sync.sh, runs a fixed number of iterations (current 5) that
invokes drop-stuff.sh then opens the app, waits a fixed amount of time
(currently 120 seconds), and then kills the app and measures how many messages
it synced which it prints to the console. This is sufficient for us to start
measuring how quickly we can sync messages. This diff also includes the
sqlite3 amalgamation which drop-stuff.sh requires to function correctly
due to depending on the FTS5 extension which doesn't come built-in on
some platforms.
Test Plan: Run benchmark locally
Reviewers: evan, spang, juan
Reviewed By: juan
Differential Revision: https://phab.nylas.com/D4275
