Reduce "shim types", introduce agreement.Block #21
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agreement.Block is similar to what was agreement.ProposableBlock, but rather than being an interface it is a concrete type. Therefore, there can be no confusion: A validated block is not an agreement.Block just because it has a Block() method.
Instead, FinalizeBlock methods explicit copy their internal Block() objects into agreement.Block objects during finalization.
This PR also eliminates node.validatedBlock as
*ledgercore.ValidatedBlock implements agreement.ValidatedBlock already, no wrapper is needed. Blocks remain as immutable as before.