1. Add permission filter service to separate permission filtering logic
from conversation queries
2. Implement hierarchical permissions with cleaner logic:
- conversation_manage gives access to all conversations
- conversation_unassigned_manage gives access to unassigned and user's
conversations
- conversation_participating_manage gives access only to user's
conversations
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Co-authored-by: Pranav <pranav@chatwoot.com>
* Chore: Enable Users to create multiple accounts
Addresses: #402
- migrations to split roles and other attributes from users table
- make changes in code to accommodate this change
Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>
