Make Cyphernode State Management Pluggable

[cristovaoth]

This is an experimental PR, most likely will end up being discarded.

The best option is to probably for the moment keep state management in the Registry. At any rate, it can't hurt to put an example sketch together.

Discussion

As discussed, when a committee is published, several checks need to be performed:

• Are the nodes eligible?
• Does the key match the selected nodes?
• Etc.

The registry is the central point of coordination. Since we have made filtering and sortition pluggable, we should also at least consider making state management pluggable. The main reasons for this are the limited knowledge that certain components should maintain from different parts of the system:

• Enclave: Only concerned with committee status and committee key.
• Registry: Only cares about who the filters are, who the state manager is, connects them all together
• Filter: Only cares about which nodes are eligible for an upcoming committee.
• State Management: The central place where Cyphernode logic will be contained, including staking, duty tracking, responsiveness tracking, bond tracking, slashing, etc.

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