What does this PR do?

Implements PandaDoc piece with 3 triggers, 5 actions, and 2 read operations for document automation workflows.

Explain How the Feature Works

• Triggers: Document completion, state changes, updates
• Actions: Create documents, manage contacts, attachments, search
• Reads: Get details, download PDFs
• Enhanced UX with dynamic dropdowns + custom inputs

Relevant User Scenarios

• Auto-update CRM when contracts signed
• Generate proposals from templates
• Track document status changes
• Sync contacts across systems

Fixes #7917 /claim #7917

Here is a demo @kishanprmr

https://github.com/user-attachments/assets/68f25559-9009-456c-9149-d8a3d3bf436e