accounts/abi: generic unpacking of event logs into map[string]interface{} (#18440)

Add methods that allow for the unpacking of event logs into maps (allows for agnostic unpacking of logs)

accounts/abi/bind/base.go

@@ -340,6 +340,22 @@ func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log)
 	return parseTopics(out, indexed, log.Topics[1:])
 }
 
+// UnpackLogIntoMap unpacks a retrieved log into the provided map.
+func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event string, log types.Log) error {
+	if len(log.Data) > 0 {
+		if err := c.abi.UnpackIntoMap(out, event, log.Data); err != nil {
+			return err
+		}
+	}
+	var indexed abi.Arguments
+	for _, arg := range c.abi.Events[event].Inputs {
+		if arg.Indexed {
+			indexed = append(indexed, arg)
+		}
+	}
+	return parseTopicsIntoMap(out, indexed, log.Topics[1:])
+}
+
 // ensureContext is a helper method to ensure a context is not nil, even if the
 // user specified it as such.
 func ensureContext(ctx context.Context) context.Context {