Implement PEP-517 compatible system with pyproject.toml

[djpugh]

Implement PEP-517 compatible system

• Migrate to pyproject.toml
• Tidy plugins structure slightly
• Implement tox handling for pyproject.toml
• Remove requirements.txt/embed-requirements.txt (now in pyproject.toml)
• Remove supported python versions (now parsed from pyproject.toml)
• Added mypy type checking

[codecov]

Codecov Report

Merging #76 (cc12137) into main (db67dc7) will decrease coverage by 4.61%.
The diff coverage is 88.57%.

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   98.58%   93.97%   -4.61%     
==========================================
  Files           6        6              
  Lines         141      166      +25     
==========================================
+ Hits          139      156      +17     
- Misses          2       10       +8     

Flag	Coverage Δ
tests	93.97% <88.57%> (-4.61%)	⬇️

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Impacted Files	Coverage Δ
src/azure_devops_artifacts_helpers/_get_version.py	68.00% <68.00%> (ø)
src/azure_devops_artifacts_helpers/__init__.py	100.00% <100.00%> (ø)
src/azure_devops_artifacts_helpers/cli.py	100.00% <100.00%> (ø)
src/azure_devops_artifacts_helpers/plugins/tox.py	97.18% <100.00%> (ø)
src/azure_devops_artifacts_helpers/seed.py	100.00% <100.00%> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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