Create utility function to create the right folder structure for headers in the ReactCommon folder

Summary:
## Context

One of the quirk of SwiftPM is that the packages has to have access to the headers they need. Usually this is solved by properly setting the header_search_path. However, in  SwiftPM, we are not allowed to use headers search path that escape the package itself (basically, header search path can't start with `../`).

To work around this limitation we are recreating the correct Header structure by using hardlinks to the actual headers.

## Changed

In this change we are adding an helper function that creates links for the ReactCommon folder that has a complex structure and complex mapping requirements

## Changelog:
[Internal] -

Differential Revision: D81778470

Author: cipolleschi