feat: add chainId field to Token type

Author: toniocodo

src/indexers/collector/EventHandlers.ts

@@ -18,6 +18,7 @@ ERC20.Transfer.handler(
         address: event.srcAddress,
         symbol: token.symbol,
         decimals: token.decimals,
+        chainId: event.chainId,
       });
     }
 

src/indexers/collector/schema.graphql

@@ -3,6 +3,7 @@ type Token {
   address: String!
   symbol: String!
   decimals: Int!
+  chainId: Int!
 }
 
 type Transfer {