Move kiwipy/rmq related modules into a specific module

[unkcpz]

The refactoring is targeting to decouple the dependencies of using kiwipy+rmq as the communicator for the process control.
One of the major change here is hand write the resolver of future by mimic how tho asyncio does for wrapping concurrent.futures.Future into asyncio.Future. I use the same way to convert asyncio.Future into concurent.futures.Future (which is the kiwipy.Future as alias).

• move the aio_pika import lazily by moving the rmq exceptions to rmq module, this can increase the performance of import aiida; aiida.orm.
• CancellableAction using composite to behave as a Future like object.
• use asyncio.Future in favor of alias plumpy.Future and
• use concurrent.futures.Future instead of alias kiwipy.Future.
• Hand write _chain and _copy_future since we can not just rely on the API of asyncio that is not exposed.
• Forming the coordinator/Communicator protocol.
• Just forming the coordinator/Coordinator protocol and wrap rmq/communicator as a coordinator that not require changs in kiwipy.
• Mock the coordinator for unit test.

[codecov]

Codecov Report

Attention: Patch coverage is 80.25210% with 47 lines in your changes missing coverage. Please review.

Please upload report for BASE (dev@4611154). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/plumpy/rmq/futures.py	52.86%	33 Missing ⚠️
src/plumpy/message.py	93.27%	7 Missing ⚠️
src/plumpy/futures.py	68.75%	5 Missing ⚠️
src/plumpy/processes.py	96.16%	1 Missing ⚠️
src/plumpy/rmq/process_comms.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev     #297   +/-   ##
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  Coverage       ?   90.20%           
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  Files          ?       26           
  Lines          ?     3051           
  Branches       ?        0           
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  Hits           ?     2752           
  Misses         ?      299           
  Partials       ?        0           

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