[clang] [llvm] [LifetimeSafety] Reorganize code into modular components (PR #162474)

[Shilei Tian via llvm-commits]

shiltian wrote:

The clang library `clangAnalysisLifetimeSafety` doesn't set any dependencies so it completely breaks dynamic library build.

https://github.com/llvm/llvm-project/pull/162474