Implement switching endpoints after slow eth_getLogs RPC requests (#525)

* Switch upstream endpoint if getLogs requests are too slow

* Refactor methods for switching client to indexer

* Update codegen indexer template

* Add dummy methods in graph-node test Indexer

* Upgrade package versions to 0.2.101

---------

Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

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

@@ -340,7 +340,11 @@ export class Indexer implements IndexerInterface {
     return [];
   }
 
-  switchClients ({ ethClient, ethProvider }: { ethClient: EthClient, ethProvider: providers.BaseProvider }): void {
+  async switchClients (): Promise<void> {
     return undefined;
   }
+
+  async isGetLogsRequestsSlow (): Promise<boolean> {
+    return false;
+  }
 }