Override __repr__ to make debugging easier
Override __repr__ to make debugging easier

Summary:
Right now sentry traces aren't super helpful because every SQLAlchemy object looks like this:
`<inbox.models.event.RecurringEvent object at 0xae6ab10>`.

This diff changes `__repr__` for SQLAlchemy objects to display the object's id.

Test Plan: Tested manually.

Reviewers: spang

Reviewed By: spang

Subscribers: jenkins

Differential Revision: https://phab.nylas.com/D2955

nylas/sync-engine,closeio/nylas,nylas/sync-engine,jobscore/sync-engine,nylas/sync-engine,nylas/sync-engine,closeio/nylas,jobscore/sync-engine,jobscore/sync-engine,closeio/nylas,jobscore/sync-engine,closeio/nylas