Summary: This diff migrates `FbReactTTRCStepRenderFlagManager` to use the generated `TTRCStepRenderFlagManagerDelegate` for setting its properties. A bit more work was required to migrate this view manager since it doesn't extend `BaseViewManager`, so I had to add an adapter which made it possible to pass an instance of `FbReactTTRCStepRenderFlagManager` to `TTRCStepRenderFlagManagerDelegate`.
Reviewed By: mdvacca
Differential Revision: D16984172
fbshipit-source-id: 7bf8c1342435c4e615eb9e7ca711f53c63ed3438