Add `tryGetMutableBuffer` API (#55943)

Summary:

Adds `ArrayBuffer::tryGetMutableBuffer` to JSI. This allows the user to
retrieve a `MutableBuffer` from the `ArrayBuffer`. The returned buffer 
will point directly into the same buffer as the runtime object, rather than
copying it out.

The data referencedby the `MutableBuffer` will be alive during the entirety
 of the `MutableBuffer` lifespan.

Addresses: https://github.com/facebook/hermes/issues/1578

Changelog: [Internal]

Reviewed By: tmikov

Differential Revision: D91264901