Support topic filters in event handlers (#1598)

* Allow 3 topics in event handlers

* Add changeset

Author: incrypto32

.changeset/green-trees-vanish.md

@@ -0,0 +1,5 @@
+---
+'@graphprotocol/graph-cli': minor
+---
+
+Allow topic filters in event handlers

packages/cli/src/protocols/ethereum/manifest.graphql

@@ -95,6 +95,9 @@ type CallHandler {
 type ContractEventHandler {
   event: String!
   topic0: String
+  topic1: [String]
+  topic2: [String]
+  topic3: [String]
   handler: String!
   receipt: Boolean
 }