feat(ratelimit): implement rate-limiter API

[Integralist]

Create

$ fastly rate-limit create \
  --action response \
  --client-key "req.http.Fastly-Client-IP, req.http.User-Agent" \
  --http-methods "post, put, patch, delete" \
  --name <RATE_LIMITER_NAME> \
  --penalty-box-dur 30 \
  --response-content '{"reason": "Too many requests"}' \
  --response-content-type application/json \
  --response-status 429 \
  --rps-limit 10000 \
  --service-id <SERVICE_ID> \
  --version 1 \
  --window-size 10

SUCCESS: Created rate limiter '<RATE_LIMITER_NAME>' (<RATE_LIMITER_ID>)

Update

fastly rate-limit update \
  --action response \
  --client-key "req.http.Fastly-Client-IP, req.http.User-Agent" \
  --id <RATE_LIMITER_ID> \
  --http-methods "post, put, patch, delete" \
  --name <RATE_LIMITER_NAME> \
  --penalty-box-dur 30 \
  --response-content '{"reason": "Too many requests"}' \
  --response-content-type application/json \
  --response-status 429 \
  --rps-limit 10000 \
  --window-size 10

SUCCESS: Updated rate limiter '<RATE_LIMITER_NAME>' (<RATE_LIMITER_ID>)

fastly rate-limit update \
  --id <RATE_LIMITER_ID> \
  --name new-name-here

SUCCESS: Updated rate limiter '<RATE_LIMITER_NAME>' (<RATE_LIMITER_ID>)

List

fastly rate-limit list --version 1 --service-id <SERVICE_ID>

Describe

fastly rate-limit describe --id <RATE_LIMITER_ID>

Delete

fastly rate-limit delete --id <RATE_LIMITER_ID>