Torchfl

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* Documentation fix.

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* Code cleanup using pre-commit hooks.
* Bug fixes.

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* Officially launched the federated learning modules.
* Added extensive examples for federated and non-federated settings.
* Updated the documentation.

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* Major changes.
* Added workflows to build the torchfl package before merging it to master.
* Updated the existing workflows to include the checks for all python versions.
* Removed the usage of Literal type to enable py36, and py37 support.
* Defined a common cache in home dir for torchfl.

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* Bug fixes.

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* Bug Fixes.
* Documentation Update and Dependency conflict resolution.