[clang-tools-extra] [clang-tidy] Add `bugprone-virtual-arithmetic` check (PR #91951)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL commented:

Few nits.
My main concern is an check name, had to open PR to find out what it does.
maybe should be more a "bugprone-arithmetic-on-polymorphic-pointer" or something like that.

https://github.com/llvm/llvm-project/pull/91951