feat: rate limiting based on upstream replicas

*Description*:
It would be incredibly beneficial if rate limits could be dynamically adjusted based on the number of replicas of the upstream service/application. This would be a powerful approach for applications that combine autoscaling through KEDA (https://keda.sh/) with rate limiting.

E.g:
Deployment of 3 replicas of the App
Rate limits for the App are: 6 req/sec (e.g.: per client)
I change (or KEDA changes) amount of replicas of the App from 3 to 6 and It would be great if rate limiting pod reflects this change and edit amount of rate limits to 12 req/sec (default rate limits x deployment replicas).