* Test case for wasm out of memory error
* Restart wasm instance after N blocks
* Handle out of memory error and re instantiate WASM
* Remove old instance from map before reinstantiating WASM
* 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