Summary:
Motivation described in diff 1/N.
This diff replaces calls to `[bridge reload]` with calls to `RCTReloadCommand`. This shouldn't have any change in behaviour since RCTBridge listens to RCTReloadCommand and calls `[bridge reload]` [here](https://fburl.com/diffusion/kemzkrei).
It will allow us to customize who listens and reacts to RN lifecycle.
Changelog: [Internal][Changed] - Migrated [bridge reload] calls to RCTReloadCommand
Reviewed By: shergin
Differential Revision: D17880909
fbshipit-source-id: 80b26c6badd4b216656fed6dd04554e9877f4bb7