[DO NOT MERGE] Clip dot products

[alihassanijr]

DO NOT MERGE

Ampere FNA only for now.

Allows optionally clipping dot products according to some floating point range (min, max).

Issue: #249

TODO:

• [ ] Ensure bwd correctness with a math reference or gradcheck
• [ ] Add to other backends
• [ ] Add to Flex?
• [ ] Check for potential perf regressions