Enhance dummy rate limit interceptor we have.

[bwplotka]

Problem: Current limiter interface does not care about method, metadata (e.g user). So it blocks basic multitenancy use cases.

We also cannot just return something like RateLimited status for client base queuing and retrying logic if needed (:

Let's think it about it more. Also worth to check https://github.com/envoyproxy/ratelimit

cc @yashsharma44

[yashrsharma44]

Is it fixed by #386 or do we want to add more implementations(provider) for this?

[bwplotka]

This is done thanks to @MalloZup PR indeed 💪🏽