[clang] [analyzer] Implement LifetimeAnnotations checker. (PR #205521)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun approved this pull request.

Overall, looks great to me. I think the checker name/doc could be improved and wondering if there is some dead code that should belong to the follow-up PR, but otherwise looks really strong! 

https://github.com/llvm/llvm-project/pull/205521