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

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yronglin wrote:

> This PR is starting to get quite large. Can [Modules Dependency Discover](https://github.com/llvm/llvm-project/pull/102135/commits/581160a121fca5796bff2392d9228207d37e6f16) be split in a separate PR?
> 
> Edit: ie, maybe we can implement P1857R3 first ?

This sounds good to me. Let me give a try. IIUC, we should implement P1857R3(include new tok::annot_module_name) firstly? P3034R1 has very little content. Most of this PR is dealing with tok::annot_module_name. WDYT? 

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