[clang] [clang-format] Add ObjCSpaceBeforeMethodDeclColon option to control space before Objective-C method return type (PR #170579)

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https://github.com/owenca requested changes to this pull request.

Please link a public style guide that wants no space after the +/- prefix. See https://clang.llvm.org/docs/ClangFormatStyleOptions.html#adding-additional-style-options. Also, add a `CHECK_PARSE_BOOL` test.

https://github.com/llvm/llvm-project/pull/170579