Add new mechanism for installing clang tools

[2bndy5]

Initially I was going to develop a rust port of clang-tools-pip in a separate repo named clang-tools-installer.

Instead I could incorporate the idea into this project. Then cpp-linter can ship with install capability that is invoked when necessary.

Ideally, it would install (in order of preference):

1. The stripped dynamic binaries from the clang-tidy and clang-format projects on PyPI.
2. dynamic binaries from OS-native package manager (apt on linux, homebrew on macos, chocolate on windows). This option would involve downloading (at cpp-linter-rs build time) and executing (at runtime) the official LLVM install script. This step would get skipped if the package manager is not present.
3. the static binaries from cpp-linter/clang-tools-static-binaries builds

[2bndy5]

Note to self

A helpful gist about using indicatif lib to display progress bars when downloading a file asynchronously: https://gist.github.com/Tapanhaz/096e299bf060607b572d700e89a62529

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[2bndy5]

I've been improving the CLI about version specifiation. I'm gearing up to resolve this...

Ref: cpp-linter/cpp-linter-action#364 (comment)

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.