Add function to package the xcframework (#49434)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49434

This change adds a function to create the xcframework sarting from the various .framework's slice built before.

## Changelog:
[Internal] - Add function to create the xcframework

Reviewed By: cortinico

Differential Revision: D69660662

fbshipit-source-id: f58034c75cce3d242910d0ec1512be28059771ca