[ADD] contract_timesheet_monitoring

[victor-champonnois]

Follow time spent on projects related to contract lines.

task : https://gestion.coopiteasy.be/web#id=10943&action=475&active_id=157&model=project.task&view_type=form&menu_id=536

@robinkeunen

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 94.10%. Comparing base (110387a) to head (a21fe81).

Files	Patch %	Lines
...tract_timesheet_monitoring/models/contract_line.py	85.71%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             16.0     #317      +/-   ##
==========================================
- Coverage   94.17%   94.10%   -0.08%     
==========================================
  Files          34       39       +5     
  Lines         584      611      +27     
  Branches       56       60       +4     
==========================================
+ Hits          550      575      +25     
- Misses         27       28       +1     
- Partials        7        8       +1     

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