Summary:
@public
Introduces `HasJavascriptExceptionMetadata`, a thin interface to be implemented by all RN (Android) exception classes that represent JavaScript errors (primarily `JavascriptException` and any subclasses).
Also adds a builder-style API for setting the `extraDataAsJson` field on `JavascriptException` instances.
Reviewed By: abhinavbatra
Differential Revision: D16090574
fbshipit-source-id: 427a0d371f1cb4e6fe2e62a91db7857a191fdb8c
Moti Zilberman