Add ability to enable / disable access log.

In high frequency environments it can be a little bit noisy.

main.go

@@ -28,6 +28,7 @@ func parseConfig() {
 	c.Logger = libpack_logging.NewLogger()
 	c.Client.GQLClient = graphql.NewConnection()
 	c.Client.GQLClient.SetEndpoint(c.Server.HostGraphQL)
+	c.Server.AccessLog = envutil.GetBool("ENABLE_ACCESS_LOG", false)
 	cfg = &c
 	enableCache() // takes close to no resources, but can be used with dynamic query cache
 }