[Umbrella] Bare-bones Reconfiguration/Epoch Support

[todd-mystenlabs]

Details

We expect the following as bare-bone requirements:

• There is epoch and it changes through reconfiguration
• Validator set is able to change at epoch boundary
• Transactions are consistently executed within epochs (i.e. a cert can only be executed at one epoch across all validators)

Requires checkpointing to work first.

Design and Eng Plan: Design: https://www.notion.so/mystenlabs/Sui-Reconfiguration-4841e67f57564791b2bcad435fedc6e5

Dependent Tasks

• [authority] Add epoch to order #225
• [authority/devnet] How To Check If Two Authorities Are In Sync? #842
• [Umbrella] [MoveLib] Tokenomics and Governance contract #1394
• [fastx] How to facilitate Bulk Sync between authorities, authorities and full replicas #194
• [fastx] How to best integrate information from a consensus core to allow more general fastx smart contracts #195
• [Umbrella] [Sync] Engineering plan for follower (A), transaction dissemination (B) and check pointing (C) #1099

[asonnino]

The following PR should take care of most of it: #3750