Added masked scatter func

[sroycho4]

Now, the masked_scatter function is implemented using PyTorch's torch.Tensor.masked_scatter method

[github-actions]

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[sroycho4]

Added masked scatter func !!!!!

[Sarvesh-Kesharwani]

This PR contains the similar problem as This PR raised by you.
Please work on it and let me know.

[Ishticode]

Closing this due to inactivity after the comment above by @Sarvesh-Kesharwani requesting some cleanup of unrelated changes which still seem to present. Please feel free to reopen if you would like to continue working on this. Thanks :)