[run-clang-tidy.py] Refactor, add progress indicator, add type hints (#89490)

Summary:
[There is
work](https://discourse.llvm.org/t/rfc-upgrading-llvms-minimum-required-python-version/67571)
to make Python 3.8 the minimum Python version for LLVM.

I edited this script because I wanted some indicator of progress while
going through files.
It now outputs `[XX/YYY]` with the number of processed and total files
after each completion.

The current version of this script is compatible downto Python 3.6 (this
is PyYAML's minimum version).
It would probably work with older Python 3 versions with an older PyYAML
or when YAML is disabled.

With the updates here, it is compatible downto Python 3.7. Python 3.7
was released June 2018.

#89302 is also touching this
file, I don't mind rebasing on top of that work if needed.

### Summary

 -  Add type annotations.
 -  Replace `threading` + `queue` with `asyncio`.
- **Add indicator of processed files over total files**. This is what I
set out to do initially.
- Only print the filename after completion, not the entire Clang-Tidy
invocation command. I find this neater but the behavior can easily be
restored.

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

Tags: 


Differential Revision: https://phabricator.intern.facebook.com/D60251392

Author: nicovank