Refactoring of `communication`: separate `mpi4py`-wrappers from `DNDarrays`

[mrfh92]

Currently, the code wrapping mpi4py for torch.Tensor's is contained in heat/core/communication.py and not fully separated from constructions related to the DNDarray-class (e.g., computation of chunk sizes is also introduced there).

I would suggest to separate this clearly, which may also make #482 and similar work easier:

• code wrapping mpi4py for torch.Tensor's becomes an own module of heat
• in heat/core/communication.py this module can be used

Diclaimer: feel free to discuss other ideas for refactoring and/or that status-quo does not need changes

[github-actions[bot]]

Branch features/1243-Refactoring_of_communication_separate_mpi4py_-wrappers_from_DNDarrays created!

[github-actions[bot]]

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