Fix retry on error for events processing job with exponential backoff (#468)

* Throw error in job-runner events processing queue for retry

* Restart block processing after completion of retried events queue job

* Check events queue size in retry state from active historical processing job

* Clear watched contracts from memory map on reset

* Update sync status with zero hash during historical processing

* Update codegen for changes

* Add clearProcessedBlockData in graph-node test dummy indexer

packages/graph-node/test/utils/indexer.ts

@@ -318,6 +318,10 @@ export class Indexer implements IndexerInterface {
     return undefined;
   }
 
+  async clearProcessedBlockData (block: BlockProgressInterface): Promise<void> {
+    return undefined;
+  }
+
   cacheContract (contract: ContractInterface): void {
     return undefined;
   }