Initial commit for the optimized gdn impl

refactor comments

replaced gdn to align w/ pytorch gdn

Add kl div test

Use seq_len instead of S

Fixed transpose error and removed testing functions

Keep naive gated delta rule impl for ref

refactor comments on GDN functions

Update tflops calc to align w/ megatron & update dtype for GDN

Fix spacing issues in linter

Run precommit for pylint fix

Convert lambda func to explicit function using def

Add megatron ref for gdn tflops

ran pyink formatter

Author: Rohan-Bierneni