Support clang-cl in default profile plugin

[lukester1975]

Changelog: Feature: Support clang-cl in default profile plugin.
Docs: conan-io/docs#3387

This is a follow up to ##13424 (comment), item 2 this time.

It would be nice if cl and clang-cl were consistent wrt runtime_type, though since the profile can set the value explicitly, it's not the end of the world if you think this is a bad idea (as far as I've looked runtime would only be set with a cl-like compiler, so should be good?).

If it's viable:

• I suppose https://docs.conan.io/2/reference/extensions/profile_plugin.html could do with an update but I'm not sure where that lives (a quick check of the docs and web repos was unsuccessful).
• I've removed runtime_type from Feature/set meson b_vscrt with clang-cl #14664 tests; the now fail without the plugin change and succeed with. Or maybe there should be a test both with and without?

Thanks

• Refer to the issue that supports this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one.

[memsharded]

Fantastic, thanks!

Yes, this is viable, the change makes sense, and it has no risk, as runtime is an user input, they explicitly decide if it is clang with msvc runtime (both clang and clang-cl) or clang with gnu/msys2 backend