feat(multiprocess): implement ConnectOnSubprocessFactory and related classes [part 10/11]

[glevco]

Depends on #1166

Motivation

What was the motivation for the changes in this PR?

Acceptance Criteria

• Implement ConnectOnSubprocessFactory and related classes.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: Patch coverage is 46.89266% with 94 lines in your changes missing coverage. Please review.

Project coverage is 84.48%. Comparing base (cb9f709) to head (e761796).

Files with missing lines	Patch %	Lines
hathor/multiprocess/subprocess_runner.py	48.35%	47 Missing ⚠️
hathor/multiprocess/connect_on_subprocess.py	45.45%	42 Missing ⚠️
hathor/multiprocess/utils.py	44.44%	5 Missing ⚠️

Additional details and impacted files

@@                           Coverage Diff                            @@
##           refactor/p2p/p2p-connection-protocol    #1167      +/-   ##
========================================================================
- Coverage                                 84.73%   84.48%   -0.25%     
========================================================================
  Files                                       318      321       +3     
  Lines                                     24508    24685     +177     
  Branches                                   3742     3749       +7     
========================================================================
+ Hits                                      20766    20855      +89     
- Misses                                     3000     3094      +94     
+ Partials                                    742      736       -6     

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