Communication Spaces
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A Communication Space is the underlying message passing mechanism that sampik uses to perform communications, e.g. MPI or NCCL.

Communication Spaces are used to specialize a ``sampik::Handle`` for a given backend. Handles wrap a backend's "communicator" objects and provide generic interfaces for retrieving information such as the size or rank of the underlying communicator.

``sampik::MPI``
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``sampik::MPI`` is a type of that "implements" the ``CommunicationSpace`` concept, representing communications that use MPI. 

``sampik::NCCL``
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``sampik::NCCL`` is a type of that "implements" the ``CommunicationSpace`` concept, representing communications that use NCCL.