[libc++] Adds a new feature-test macro generator class. (#90889) The new feature-test macro generator uses a JSON file as input. Separating the code from the data allows for testing the code. The generator has several tests. This JSON format is based on the new format proposed in #88630 At the moment the FTM script has the existing code and an unused new generator. Followup patches will complete the generator and convert the existing Python `dict` to the new JSON format. Since that conversion is a manual job and quite a bit of work the transition path has some unused code for some time.
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