Update to v1.0.2

[nunofachada]

Several updates:

• Add py.typed file so that third-party code can correctly use and be tested against types defined in ParShift.
• Fix several Mypy issues occurring from the issue above and newer Python versions.
• Set minimum Python version to 3.9 due to Mypy.
• Validate package with Python 3.13.

After the pull request is accepted:

• Create a token in CodeCov for ParShift.
• Add the CODECOV_TOKEN variable (with the value defined above in CodeCov) to GitHub -> Settings -> Secrets and variables -> Actions -> Repository secrets.
• Release version v1.0.2 on GitHub, mentioning the "Several updates" above; this will automatically release the new version on PyPi, update the docs, and update the coverage in CodeCov, hopefully.

Why is this needed:

• Apart from regular package maintenance, the fact that the package is typed allows us to better test the quality of code generated to use this package.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.65%. Comparing base (93ecb74) to head (304b879).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   98.66%   98.65%   -0.01%     
==========================================
  Files           5        5              
  Lines         299      298       -1     
==========================================
- Hits          295      294       -1     
  Misses          4        4              

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