* Update state network to use addressHash instead of address in contract trie and contract code content keys.
* Fix path calculation bug in getParent when working with extension nodes.
* Bump portal spec tests repo.
* Finish updating tests due to portal test vector changes.
* Update Fluffy state bridge to use addressHash.
* Update Fluffy book with correct commands for running portal hive tests.
* Create block offers queue and collect account preimages.
* Implement iterators to return account and storage proofs and bytecode from updatedCaches.
* Implement building offers from proofs.
* Refactor BlockDataRef type to only include required fields.
* Store block data in database.
* Improve state diff types.
* Implement start state backfill from specific block.
* Record last persisted block number in database.
* Persist account preimages in db.
* Apply state updates for DAO hard fork.
* Implement state gossip of block offers via portal JSON RPC.
`initTable` is obsolete since nim 0.19 and can introduce significant
memory overhead while providing no benefit (since the table will be
grown to the default initial size on first use anyway).
In particular, aristo layers will not necessarily use all tables they
initialize, for exampe when many empty accounts are being created.
* Refactor get parent gossip code and add Nibbles helper function.
* Add logging to state gossip.
* Unit test recursive gossip using state gossip getParent functions.
* Add recursive gossip genesis json test and fix bug in state gossip getParent.
* Add Nibbles len function.
* Add toContentKey helper functions.
* Implement typed lookup functions for getting account and storage trie nodes and bytecode.
* Re-implementation of recursive gossip.
* Offer validation improvements. Don't allow key end in Nibbles for leafs as defined in the spec.
* Minor refactor to validation and add addition bytecode check.
* Implemented offer validation interface.
* Implement high level offer validation steps.
* Completed state validation tests.
* Update validation to use result type.
* Update state proof verification tests to test offer verification.
* Query history network to get state root by block hash.
* Fix state network test and remove usage of CoreDb.
* Fix state network gossip test and PR comment updates.
* Add trieproof state validation tests and fix for short nodes.
