[clang-tidy] suggest adding `noexcept` to non-throwing functions

It could be helpful to suggest to add `noexcept` to functions which are not throwing.

I understand that this would be an extremely noisy check but it would provide an opposite approach to more robust exception handling to `bugprone-exception-escape.TreatFunctionsWithoutSpecificationAsThrowing: OnlyUndefined`.

Start with clang-tidy and the bugprone-exception-escape check, especially TreatFunctionsWithoutSpecificationAsThrowing: OnlyUndefined. Determine the intended scope and noise policy for suggesting noexcept, then establish the check behavior and test expectations before implementation.

Written by the indexing model from the issue text.