Get `enable_x_ratelimit_headers: DRAFT_VERSION_03` to work

[chirino]

I tried setting the enable_x_ratelimit_headers option in the envoy rate limiting filter. But the expected headers were not set in the response.

the filter's configuration looks like:

                  - name: envoy.filters.http.ratelimit
                    typed_config:
                      "@type": type.googleapis.com/envoy.extensions.filters.http.ratelimit.v3.RateLimit
                      domain: nexodus
                      failure_mode_deny: false
                      timeout: 0.05s
                      enable_x_ratelimit_headers: DRAFT_VERSION_03
                      rate_limit_service:
                        transport_api_version: V3
                        grpc_service:
                          envoy_grpc:
                            cluster_name: ratelimiter

The only header I see in the responses is x-envoy-ratelimited: true, I was hoping to get headers like X-RateLimit-Limit: 10, 10;w=1;name="per-ip", 1000;w=3600

Tasks

• [x] Add support in Limitador's gRPC
• [x] Add configuration option to Limitador server
• [x] Add support in the wasm-shim
• [x] Add support to configure in limitador-operator

[pehala]

Not tested by QE currently.