[Clang-Tidy] Empty Check

Adds a clang-tidy check for the incorrect use of `empty()` on a
container when the result of the call is ignored.

Authored-by: Abraham Corea Diaz <abrahamcd@google.com>
Co-authored-by: Denis Nikitin <denik@google.com>

Reviewed By: cjdb

Differential Revision: https://reviews.llvm.org/D128372