Riccardo Cipolleschi 072b105f52 Add function to extract headers from a folder (#53737)
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53737

This change add a utility function to extract headers (both .h and .hpp) from a folder. It also allow to exclude some specific folders (e.g.: `tests`, non supported platforms, ...)

## Context
SwiftPM is very picky in how the header structure must be.
In order to preserve the import/include statements as much as possible when building from source, we can recreate the header structure in a temporary folder inside the react-native package using symlinks.

In this way, users can still modify the headers and build RNTester and HelloWorld using SwiftPM without breaking changes.

## Changelog:
[Internal] -

Reviewed By: cortinico

Differential Revision: D82205692

fbshipit-source-id: 4fa6dee2ae4790c583beb96a959b0c3045c7b50a
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