* Rename Block, Transaction types and add block query in eden-watcher schema
* Handle field name conflicts in eden subgraph entities
* Resolve entity field name conflicts while sending data for auto-diff
* Add a watcher for EdenNetwork contract
* Add events from MerkleDistributor contract to eden-watcher
* Add ERC721 Transfer and Approval events to eden-watcher schema
* Add artifacts for DistributorGovernance and MerkleDistributor contracts