Summary:
- Remove nylas-long-connection.coffee duplicate code from sync worker package
and replace with delta-streaming-connection which uses NylasAPI.longConnection
- Replacement for XHR will come in another diff -- still need to clean up and
fix some edge cases
Test Plan:
- TODO! Will add test coverage for NylasLongConnection and
DeltaStreamingConnection
Reviewers: evan, bengotow
Reviewed By: evan, bengotow
Differential Revision: https://phab.nylas.com/D2875
