feat: PDF Template Workflow

[elzody]

• Resolves: #3711
• Target version: main

Summary

API which handles extracting and filling fields from document templates using Collabora API. Part of the workflow tasks required to automate filling out templates and storing as PDFs.

TODO

• [ ] Also accept any document, not just templates -- user may want to get/fill fields from other documents as well

Checklist

• [x] Code is properly formatted
• [x] Sign-off message is added to all commits
• [ ] Documentation (manuals or wiki) has been updated or is not required