Limit number of messages we fetch at a time when doing gc
Limit number of messages we fetch at a time when doing gc

nylas/sync-engine,closeio/nylas,ErinCall/sync-engine,ErinCall/sync-engine,closeio/nylas,jobscore/sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,nylas/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,gale320/sync-engine,gale320/sync-engine,gale320/sync-engine,nylas/sync-engine,nylas/sync-engine,ErinCall/sync-engine,gale320/sync-engine,jobscore/sync-engine,jobscore/sync-engine,jobscore/sync-engine,closeio/nylas,closeio/nylas,Eagles2F/sync-engine,Eagles2F/sync-engine