Log current greenlet
Log current greenlet

Summary: Log the currently executing greenlet.

Test Plan: Ran the service and checked the log output.

Reviewers: emfree

Reviewed By: emfree

Projects: #sync-engine

Differential Revision: https://review.inboxapp.com/D564

nylas/sync-engine,EthanBlackburn/sync-engine,Eagles2F/sync-engine,EthanBlackburn/sync-engine,Eagles2F/sync-engine,PriviPK/privipk-sync-engine,PriviPK/privipk-sync-engine,closeio/nylas,nylas/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,EthanBlackburn/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,nylas/sync-engine,ErinCall/sync-engine,closeio/nylas,gale320/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,PriviPK/privipk-sync-engine,jobscore/sync-engine,gale320/sync-engine,closeio/nylas,gale320/sync-engine,wakermahmud/sync-engine,jobscore/sync-engine,jobscore/sync-engine,PriviPK/privipk-sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,nylas/sync-engine,wakermahmud/sync-engine,EthanBlackburn/sync-engine,EthanBlackburn/sync-engine,closeio/nylas,PriviPK/privipk-sync-engine,ErinCall/sync-engine