Add granular permissions for field editing and message actions

Problem
Admins cannot selectively disable specific actions like contact field editing or message replies. Edits to contact fields in Front do not sync back to CRMs, causing data quality issues. There is also no way to dynamically restrict actions (e.g., preventing replies to flagged emails).

Request
Allow admins to disable specific teammate actions such as editing contact fields or replying to conversations. Support rule-triggered action restrictions so that certain actions can be blocked conditionally (e.g., when a conversation is tagged as malicious).

Context
One-way CRM syncs mean field edits in Front are overwritten on the next batch sync. Security teams need the ability to lock down reply actions on flagged emails to prevent accidental engagement with malicious senders.