[clang] [clang][ASTMatcher] Add matcher for 'matches' (PR #102152)

[Ding Fei via cfe-commits]

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@@ -288,6 +288,8 @@ AST Matchers
 - Fixed an issue with the `hasName` and `hasAnyName` matcher when matching
   inline namespaces with an enclosing namespace of the same name.
 
+- Add ``matches``.
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danix800 wrote:

```suggestion
- Add `matches` for `StringLiteral` which matches literals on given `RegExp`.
```

https://github.com/llvm/llvm-project/pull/102152