[CMake][CTE] Add "check-clang-extra-..." targets to test only a particular Clang extra tool
Create targets check-clang-extra-clang-tidy, check-clang-extra-clang-query
similar to how check-clang-sema, check-clang-parser, etc. are
auto-generated from the directory structure.
This allows running only a particular sub-tool's tests, not having to wait
through the entire check-clang-tools execution.
Differential Revision: http://reviews.llvm.org/D84176