Add opensearch client to write API log events

Related to #5 (closed)

api/lambda.go

@@ -99,6 +99,8 @@ func (api Api) Handler(baseCtx context.Context, apiGatewayProxyReq events.APIGat
 			res.Headers[api.requestIDHeaderKey] = ctx.RequestID()
 		}
 		if err := api.Service.WriteValues(ctx.StartTime(), time.Now(), ctx.RequestID(), map[string]interface{}{
+			"direction":  "incoming",
+			"type":       "api",
 			"request_id": ctx.RequestID(),
 			"request":    ctx.Request(),
 			"response":   res},