[clang-tools-extra] [clang-tidy] Rename `cert-mem57-cpp` to `bugprone-default-operator-new-alignment` (PR #165542)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

Based on https://wiki.sei.cmu.edu/confluence/display/cplusplus/MEM57-CPP.+Avoid+using+default+operator+new+for+over-aligned+types

I think name `bugprone-default-operator-new-on-overaligned-type` would better preserve meaning.

https://github.com/llvm/llvm-project/pull/165542