[core] Add local farm + tests for submitter

[Alxiice]

• Add local farm here : root/localfarm
  • This is a local render farm. It can be used either to launch parallelized nodes locally or to provide a template for submitters. It will also be used to test the submission process
• Add tests for the submitter

[codecov]

Codecov Report

❌ Patch coverage is 66.43929% with 246 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.96%. Comparing base (cca5cc5) to head (61ff830).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/submitters/localFarmSubmitter.py	63.38%	93 Missing ⚠️
localfarm/localFarmLauncher.py	49.63%	69 Missing ⚠️
localfarm/localFarm.py	68.39%	67 Missing ⚠️
meshroom/core/graph.py	0.00%	7 Missing ⚠️
tests/test_submit.py	94.23%	6 Missing ⚠️
...lugins/meshroom/pluginSubmitter/PluginSubmitter.py	78.94%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2931      +/-   ##
===========================================
+ Coverage    79.80%   79.96%   +0.16%     
===========================================
  Files           64       69       +5     
  Lines         8674     9404     +730     
===========================================
+ Hits          6922     7520     +598     
- Misses        1752     1884     +132     

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