[16.0][ADD] eiras_l10n_br_nfse_obra_custom: add new module

[CristianoMafraJunior]

Já esta na PROD deles

[codecov]

Codecov Report

❌ Patch coverage is 71.73913% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.32%. Comparing base (e543a31) to head (58d0153).
⚠️ Report is 2 commits behind head on 16.0.

Files with missing lines	Patch %	Lines
...nfse_obra_custom/models/l10n_br_fiscal_document.py	50.00%	7 Missing ⚠️
...nfse_obra_custom/models/focusnfe_nfse_municipal.py	50.00%	4 Missing ⚠️
..._br_nfse_obra_custom/models/l10n_br_fiscal_obra.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             16.0      #14      +/-   ##
==========================================
- Coverage   89.13%   85.32%   -3.81%     
==========================================
  Files          21       26       +5     
  Lines         138      184      +46     
  Branches        9       12       +3     
==========================================
+ Hits          123      157      +34     
- Misses         13       24      +11     
- Partials        2        3       +1     

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