[clang-tools-extra] Add refactoring tool to convert between ternary (?:) expressions and equivalent if/else statements (PR #166822)

[Baranov Victor via cfe-commits]

vbvictor wrote:

In current state, the tool is 150-lines long which is the size of a small clang-tidy check, so I highly advise to convert it to clang-tidy.

Also, add tests please.

https://github.com/llvm/llvm-project/pull/166822