Added A General Swish Activation Function inNeural Networks (#10415)

* Added A General Swish Activation Function inNeural Networks

* Added the general swish function in the SiLU function and renamed it as swish.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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Co-authored-by: Shivansh Bhatnagar <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>