Now uses:
* ipld direct_by_leaf StateDB for basic queries
* trie_by_cid StateDB for trie slice and proof queries
Also:
* vulcanize => cerc refactor
* Backend method to close dbs
* state tests are in multiple packages, to allow separate ginkgo suites
* removes gap-filler module
* integration tests and github workflows
* run stack-orchestrator for testnet
* fix various issues with tests, hardhat server, dockerfile
* fix cmd flags / env vars
* fix flaky tests and clean up code
* remove unused code, scripts
* remove outdated docs
* update version
* Implement getSlice API for state nodes
* Implement getSlice API for storage nodes
* Fix the helper function to create a slice of required paths
* Fix query to get state leaf key for given storage root
* Add a test to get state slice for root path
* Add checks in queries to get canonical data
* Add tests to get state slice
* Add a todo for using an iterator
* Avoid filtering out removed nodes
* Add tests to get storage slice
* Remove logs
* Populate extra contract leaves field in the response
* Update tests
* Avoid EOAs in additional data in response
* Use iterator based approach for getSlice
* Skip undesired nodes from stem and head iterators
* Update storage slice tests
* Fix meta data updates
* Use state trie to get stem nodes directly using paths
* Bugfix - Continue processing other trie nodes on encountering a leaf
* Remove unnecessary TODO
