Add the ability to insert approval-related metadata directly into the page content.

The metadata should be dynamically generated and reflect the current state of approvals for the page.

Supported metadata values:

• Approval summary

  • number of approvals triggered

  • breakdown by status (e.g. pending, approved, rejected)

• Users with pending actions

  • users whose action is currently required

• In-progress approval expiration date

• Approved approval expiration date