[Feature] [Rate Limit] Add rate limter at client side

[fangxlmr]

We already have rate limit interceptor at server side after #134. I'm considering to have one at client side to protect target service if server, since server may have no rate limit at all.

[rahulkhairwar]

I understand where you're coming from, but using an interceptor or not at the client side - will entirely be a decision by the client. So, if a client doesn't choose to add the rate limiter interceptor, the server is not protected anyway!
Or, do you suggest enforcing the client to have this interceptor somehow?

[bwplotka]

Well there is a point in this. If you don't have control over backend, there is no way you can add rate limit there. Thus you might want to rate limit on your side e.g to reduce potential cost.

Fair proposal. Help wanted, we would accept it against v2 branch.

[rahulkhairwar]

I see.. that makes sense.
I can make the changes!

[rahulkhairwar]

Hi @bwplotka , here's a PR with the changes, against the v2 branch.

Cheers!