[19.0][ADD] fieldservice_sign: customer signature and document signing

[max3903]

Fixes #1581

Summary

• New module fieldservice_sign for Odoo 19.0 with two independent, company-configurable features:
  • On-site signature capture (uses core fieldservice signature fields + optional completion guard + report)
  • Document signing via hard dependency on sign_oca (request from order, status link, optional completion guard)
• Includes unit tests (100% coverage) and demo data

Validation

• pre-commit passed
• module tests passed (--test-tags=/fieldservice_sign)
• coverage 100% (≥ 99.08%)

[max3903]

/ocabot merge nobump

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 19.0-ocabot-merge-pr-1582-by-max3903-bump-nobump, awaiting test results.

[OCA-git-bot]

@max3903 The merge process could not be finalized, because command twine upload --disable-progress-bar --non-interactive --repository-url https://upload.pypi.org/legacy/ -u __token__ odoo_addon_fieldservice_sign-19.0.1.0.0.2-py3-none-any.whl failed with output:

Uploading distributions to https://upload.pypi.org/legacy/
Uploading odoo_addon_fieldservice_sign-19.0.1.0.0.2-py3-none-any.whl
�[33mWARNING �[0m Error during upload. Retry with the --verbose option for more details. 
�[31mERROR   �[0m HTTPError: 429 Too Many Requests from https://upload.pypi.org/legacy/  
         Too Many Requests                                                      

[max3903]

Hello @sbidoul

Can you help me here?