Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/34619
When it comes to migrate existing libraries, users needs to update their .podspec files with a bunch [of changes](https://reactnative.dev/docs/0.69/new-architecture-library-ios#add-folly-and-other-dependencies).
This diff groups those changes in a single function, so that contributors can just invoke that function to prepare their dependencies.
## Changelog
[iOS][Changed] - Add function to simplify podspecs
Reviewed By: cortinico
Differential Revision: D39312203
fbshipit-source-id: ed631839e07d472a1fdcba33310f9b1d94fe2fd7