[fork detection] Disable transaction execution on split brain condition

[williampsmith]

Description

To accomplish this, we add a new singleton perpetual table to AuthorityState that saves the current execution_state of the authority, along with an in-memory field within AuthorityServer. This is initialized at startup by reading the table, and defaults to Ready. Before execution of a new transaction request in the authority, we reference the in memory execution state, and early return an error to the client if we are halted due to fork.

TODO

Note that since this state is persisted, in order to undo it, there needs to be another call to reset the state. Planning on adding an api to the admin port for mutating the state, either to or from the Ready state, so that a validator can re-enable execution after an issue has been resolved.

Test Plan

Added to split brain e2e test

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Type of Change (Check all that apply)

• [ ] protocol change
• [ ] user-visible impact
• [ ] breaking change for a client SDKs
• [ ] breaking change for FNs (FN binary must upgrade)
• [ ] breaking change for validators or node operators (must upgrade binaries)
• [ ] breaking change for on-chain data layout
• [ ] necessitate either a data wipe or data migration

Release notes

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