Generic atomic operation

[adayton1]

Summary

• This PR is a feature
• It does the following:
  • Adds a generic atomic operation at the request of myself

Use case:

• Computing a signed distance field, and need to do the atomic comparison based on the absolute value but update with the signed value.
• I think I've also seen the need for an atomic multiply in an application.

Design discussion points:

• atomicGeneric seemed like a less overloaded name than atomicOperation (which would confuse vendors)
• To keep the interface and implementation simple, no short-circuiting or custom comparison functions were added in this merge request. They could be added in a future merge request.

[johnbowen42]

I have two nits: one where we could replace a static_assert with concepts, one where extra performance could be gained with an early exit condition inside the generic loop. However I think this is fine as is and don't want to block

[johnbowen42]

we might get a small performance hit here whenever we perform an operation like <=, where early exit is possible upon equality

[adayton1]

Yeah, that's likely. I was thinking we could add an overload with short-circuiting in a future PR.