[llvm] [llvm-debuginfo-analyzer] Add support for parsing DWARF / CodeView SourceLanguage (PR #137223)

[Javier Lopez-Gomez via llvm-commits]

jalopezg-git wrote:

Thanks for the review, @CarlosAlbertoEnciso :+1:!  See my [concern above](https://github.com/llvm/llvm-project/pull/137223#discussion_r2080106549) about going for `StringPool` + `LanguageIndex` for the representation of the source language.

https://github.com/llvm/llvm-project/pull/137223