Summary:
I've decided to break my snooze patches in multiple parts to make it easier to review. This diff contains all the code related to running workers in the cloud. Cloud workers all inherit from the `Worker` class which defines a bunch of useful things like error handling.
What's left to do:
- spawn workers based on the plugin type
- add monitoring (I'm going to add a simple HTTP endpoint for that)
- writing a migration for the local sync db and the prod metadata db.
Test Plan: Tested manually.
Reviewers: halla, evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D3814
