Finilize State Sync

[volovyks]

Description (updated)

Design: https://github.com/sig-net/mpc/blob/develop/doc/mpc_node_specification.md

Success metrics:

• Same number of Total on all nodes Total should not diverge without a good reason
• Sum of mine triples and pre-signatures on all nodes is equal to 'total' Ps and Ts Same, can be different, but this is a good metric to understand how fragmented the storage is.
• Sync is triggered according to design

Related comment: #649 (comment)