FIP_82b: Authorise the TribalCouncil with necessary protocol roles

This is the second stage of the Tribe DAO Governance upgrade. Overall, this proposal prepares the 
TribalCouncil and optimistic governance pods system to operate the protocol in an optimistic fashion.

Specifically, the proposal:
1. Creates various new operational roles which the TribalCouncil will hold
2. Transfers the admin of all non-major roles to the TribalCouncil (all major roles remain under the control of the DAO)
3. Makes the TribalCouncil the admin of various operational smart contracts
4. Creates a new PCVGuardian with a modern, more secure access control pattern

The governance upgrade discussed and authorised by the following forum post and snapshot vote:
- Forum: https://tribe.fei.money/t/fip-82-governance-enhancements/3945
- Snapshot vote: https://snapshot.fei.money/#/proposal/0x463fd1be98d9e86c83eb845ca7e2a5555387e3c86ca0b756aada17a11df87f2b

The executable code associated with this proposal is available here:
- https://github.com/fei-protocol/fei-protocol-core/pull/678