* Add ipld-blocks entity generation
* Populate ipld-blocks table
* Rename ipld-block entity and update after each event
* Move ipld-hook to hooks.ts
* Change IPLD block structure
* Add cid field in blocks
* Fetch prev. IPLDBlock for a contract
* GQL API to query IPLDBlock by CID
* Save cid in blocks in existing watchers
* Update codegen docs
* GQL API for getting last derived state (#3)
* GQL API for getting last derived state
* Rename query to getState
* Change query names to getState and getStateByCid
* Save BigInt as string
* Move function to prepare IPLDBlock to indexer
* Refactor IPLDBlock hook
* Add genesis hook
* Call post-block hook after a block is marked as complete
* Add IPLDBlock checkpointing
* Use queryRunner instead of a new repo for queries
* Add a query to get block in ipld-eth-client
* Get latest checkpoints for all contracts for checkpointing.
* Call post-block hook in a queue
* Pass server config to Indexer in watch-contract cli
Co-authored-by: nikugogoi <nabarun@deepstacksoft.com>