[clang] [C++20][Modules] Implement P1857R3 Modules Dependency Discovery (PR #107168)

[Hubert Tong via cfe-commits]

https://github.com/hubert-reinterpretcast commented:

The treatment of keywords should be different from that of the alternative 
tokens.
```cpptypedef int import;
import extern x;  // expected-error {{}}
```

https://github.com/llvm/llvm-project/pull/107168
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