Include account system changes in block merkle root

[monstrobishi]

What would you like to be added:

Include account system changes in block merkle root, by calculating the entire account state, hashing it and including it as part of the merkle root.

Why is this needed:

Account system state is not currently enforced strongly by the information in the block, encoding the account state as part of the merkle root ensures that account changes are reflected and strongly enforced at every block.

[defichain-bot]

@monstrobishi: Thanks for opening an issue, it is currently awaiting triage.

The triage/accepted label can be added by foundation members by writing /triage accepted in a comment.

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[monstrobishi]

/triage accepted

[uzyn]

Done with #337