Distributed tests

[kozlov721]

• All the tests are now fully independent and sandboxed:
  • More robust environment
  • Possible to run tests in parallel using pytest-xdist plugin
    • Roughly 3 times faster execution of GH workflows
  • conftest.py updated with some useful fixtures for easier sandboxing of tests:
    • tempdir - an empty temporary directory
    • dataset_name - a unique name that can be used for instantiation of LuxonisDataset
    • randint - a random integer between 0 and 100,000
    • python_version - the version of Python running the tests
    • platform_name - the name of the platform running the tests
• Cleaned up tests for LuxonisFileSystem and fixed some bugs
• Fixed the s3 error (incompatible new version of aiobotocore)
• Updated CONTRIBUTING.md

[codecov]

Codecov Report

Attention: Patch coverage is 99.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.78%. Comparing base (ded9a08) to head (63a2c7b).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tests/conftest.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
- Coverage   95.85%   95.78%   -0.08%     
==========================================
  Files          89       89              
  Lines        4758     4771      +13     
==========================================
+ Hits         4561     4570       +9     
- Misses        197      201       +4     

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