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* remove outdated docs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
* Avoid joins with header and transaction tables while getting logs
* Update getLogs GQL API to accept multiple addresses
* Update version
* Update unit tests
* getLogs API changes to return txHash, make contract arg optional.
* Populate log index.
* Add test for txn hash in GetLogs request.
* Convert tx string to common.Hash after fetching.
Co-authored-by: Arijit Das <arijitad.in@gmail.com>