extras: Add option to validate RUT DV to Django model field RutField

[jtrobles-cdd]

In Django model field RutField, add an option to validate that a RUT's "digito verificador" is correct. The option is disabled by default, so it does not break backward compatibility.

[sonarqubecloud]

Quality Gate passed

Issues
5 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 SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.70%. Comparing base (e543455) to head (278d241).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/cl_sii/extras/dj_model_fields.py	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #874      +/-   ##
===========================================
+ Coverage    88.56%   88.70%   +0.13%     
===========================================
  Files           38       38              
  Lines         3490     3496       +6     
  Branches       340      342       +2     
===========================================
+ Hits          3091     3101      +10     
+ Misses         248      243       -5     
- Partials       151      152       +1     

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