EPIC: Implement Block verification (TSS) prior to persistence

[Nana-EC]

Problem

The BN must only store verified blocks utilizing TSS signature.

Solution

Add new logic to verify the block based on the block proof

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Estimation considerations

1. Construct Proof Merkle Tree of hashes (this is not the State Tree)
2. Verify the proof/sign at the end using TSS library
3. Verify agg sign. (block poof in the incoming block) with a given a Public Key (Long term ledger Id) -- This can be achieved when some parts of ""TSS Library"" are available.

Alternatives

No response

[Nana-EC]

Closing as a dupe of #89 and moved estimate notes there.