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

[Javier Lopez-Gomez via llvm-commits]

jalopezg-git wrote:

> What I would suggest is to include the command line option may be --attribute=language, to have more flexibility when dealing with the attributes.

Done too :+1:; only missing discussion on whether to transition to `StringPool` + `LanguageIndex` or use something else.

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