[clang-tidy] Match derived types in in modernize-loop-convert

This patch allows clang-tidy to replace traditional for-loops where the
container type inherits its `begin`/`end` methods from a base class.

Test plan: Added unit test cases that confirm the tool replaces the new
pattern.

Reviewed By: carlosgalvezp

Differential Revision: https://reviews.llvm.org/D140307