Clear cache of latest entities on event processing error (#201)

* Clear cache of latest entities on event processing error

* Remove lighthouse-watcher and update ethersjs version

* Handle GraphDecimal type in state entity

* Add option for comparing all entities using paginate

* Clear pruned cached entities at intervals

* Move ipld-demo to graph-node package and remove reset-dbs script

* Implement changes in all watchers and codegen

packages/graph-test-watcher/environments/local.toml

@@ -22,6 +22,9 @@
   # Use -1 for skipping check on block range.
   maxEventsBlockRange = 1000
 
+  # Interval in number of blocks at which to clear entities cache.
+  clearEntitiesCacheInterval = 1000
+
 [metrics]
   host = "127.0.0.1"
   port = 9000