[clang-tools-extra] Add new check: do not return 0; at the end of main() in C++ (PR #77586)

[Piotr Zegar via cfe-commits]

PiotrZSL wrote:

There are ~600 other issues, not all were fully "reviewed", and there are many easy ones that aren't mark "good first issue". Once you pick something else, I will be happy to help with the review.

https://github.com/llvm/llvm-project/pull/77586