Summary: Callback blocks are frequently held onto by modules, e.g. for animation the `RCTFrameAnimation` holds onto its callback method. This causes a bunch of retain cycles since the module will be strongly held onto by the bridge.
Reviewed By: Megra
Differential Revision: D7492136
fbshipit-source-id: 708e61ffe7bf0dcffaebc056ab861b9023ffc1df