[clang-tidy] In TransformerClangTidyCheck, support option IncludeStyle.

Summary:
The new option allows the user to specify which file naming convention is used
by the source code ('llvm' or 'google').

Reviewers: gribozavr2

Subscribers: xazax.hun, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D79380