[clang] [clang-tools-extra] [flang] [lldb] [llvm] [clang] Refactor option-related code from clangDriver into new clangOptions library (PR #163659)

[Steven Wu via cfe-commits]

https://github.com/cachemeifyoucan approved this pull request.

LGTM if resolving Options.td conflict.

https://github.com/llvm/llvm-project/pull/163659