* Process hooks for the first block in the watchers
* Store initial state from a hook in an IPLDBlock for eden-watcher
* Extract watcher method to prepare IPLDBlocks in util
* Extract common IPLDBlocks related code in util
* Move IPFSClient to util
* Use constants for state kind
* Handle subgraph schema field with derivedFrom directive
* Handle derivedFrom directive in eden-watcher
* Fix 1 to N relation error by removing limit from query
* Order by id for derivedFrom relations to match graph-node
* Refactor example subgraph schema entities
* Fix watcher queries to return correct relation field values
* Fix hierarchical query for getting two entities at same block
* Create checkpoint using CLI after the hooks have been processed
* Push checkpoints created while exporting state to IPFS
* Clear subgraph entities on reset state
* Remove unnecessary staged IPLD blocks created while importing state
* Invoke handlers based on watcher-ts events
* Read subgraph yaml and listen to events from watcher-ts
* Create GraphWatcher class to use in generated example contract watcher
* Call graph-node event handler from generated watcher
