[clang] Reapply "[Clang] Implement P3034R1 Module Declarations Shouldn’t be Macros" (PR #102135)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Minor comments, I agree with @cor3ntin that you should split this into two PRs. It will be much better to review in smaller form.

https://github.com/llvm/llvm-project/pull/102135