Shahar Elyashiv

Added support hardswish function

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Before submitting - [x] Was this discussed/approved via a Github issue? Yes, #92 - [x] Did you read the [contributor guideline](https://github.com/Lightning-AI/pytorch-lightning/blob/main/.github/CONTRIBUTING.md), Pull Request section? Yes btw, the url should be...

Operator support for `F.hardswish`

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## 🚀 Feature Implement HardSwish activation function. ### Motivation Relatively easy activation function implementation as a good first issue as nikitaved suggested under #64 ### Pitch Add HardSwish (x *...