extras: Add Pydantic type for `Rut`

[jtrobles-cdd]

• Add Pydantic type cl_sii.extras.pydantic_types.Rut that can be used in place of cl_sii.rut.Rut in Pydantic models and Pydantic data classes.
• Add extra pydantic to Python package.

Ref: https://app.shortcut.com/cordada/story/9729 [sc-9729]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.45%. Comparing base (d3c0fd1) to head (945ee65). Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #696 +/- ## =========================================== + Coverage 87.36% 87.45% +0.08% =========================================== Files 37 38 +1 Lines 3070 3092 +22 Branches 379 381 +2 =========================================== + Hits 2682 2704 +22 Misses 246 246 Partials 142 142 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud