Add project URLs to pyproject.toml

[luzfcb]

This pull request includes metadata to be used by PyPI to display useful project URLs, as per the official pyproject.toml guides:

https://docs.pypi.org/project_metadata/

https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#urls

https://packaging.python.org/en/latest/specifications/well-known-project-urls/#well-known-labels

After being integrated and published on PyPi, it will display something like this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (afad969) to head (698de52).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #287   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          130       130           
  Branches        14        14           
=========================================
  Hits           130       130           

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