Title: Support for adding custom http response headers from ratelimit filter/service

Description:
We would like add custom http response headers for both allowed and rate-limited requests.
For example:
For a successful non-ratelimited request

x-rate-limit-limit: 100  
x-rate-limit-remaining: 10

For a rate-limited request
x-rate-limit-retry-after: 50

[optional Relevant Links:]
Something similar to: https://developer.twitter.com/en/docs/basics/rate-limiting