Router should call enforcer only if its necessary

[Tharsanan1]

Description:
Currently router calls enforcer for all the requests it gets. When a resource does not have authentication or ratelimit policy attached to it, this enforcer call is redundant. In most of the case endpoints like this (no auth and ratelimit attached ones) tend to invoked by a lot of users, so having this redundant enforcer call might affect the overall performance in the real world deployments.