[clang-tools-extra] [clang-tidy] Enhance modernize-use-starts-ends-with to handle substr patterns (PR #116033)

[Helmut Januschka via cfe-commits]

https://github.com/hjanuschka commented:

@nicovank feedback addressed

* added support for .size()
* more tests - incl. macros

https://github.com/llvm/llvm-project/pull/116033