[clang-tools-extra] [clang-tidy] Add check 'bugprone-assignment-in-selection-statement' (PR #180219)

[Balázs Kéri via cfe-commits]

balazske wrote:

> Could we make sure that new check also correctly warns on all test cases from `assignment-in-if-condition`.

That check produces warning even in the `if ((a = b))` case which is ignored by this check. To have a similar check only an option can be added that enables warning even in the extra parentheses case.

https://github.com/llvm/llvm-project/pull/180219