[RDS] Add Top RouteConfiguration level per-filter-config (#23295)

* Add top/routeConfiguration level typed_per_filter_config

Signed-off-by: Xin Zhuang <stevenzzz@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 8285fca7c3da4b0ab9aa35e3febab659164ba987

envoy/config/route/v3/route.proto

@@ -6,6 +6,7 @@ import "envoy/config/core/v3/base.proto";
 import "envoy/config/core/v3/config_source.proto";
 import "envoy/config/route/v3/route_components.proto";
 
+import "google/protobuf/any.proto";
 import "google/protobuf/wrappers.proto";
 
 import "udpa/annotations/status.proto";
@@ -22,7 +23,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // * Routing :ref:`architecture overview <arch_overview_http_routing>`
 // * HTTP :ref:`router filter <config_http_filters_router>`
 
-// [#next-free-field: 16]
+// [#next-free-field: 17]
 message RouteConfiguration {
   option (udpa.annotations.versioning).previous_message_type = "envoy.api.v2.RouteConfiguration";
 
@@ -140,6 +141,20 @@ message RouteConfiguration {
   // Envoy by default takes ":path" as "<path>;<params>".
   // For users who want to only match path on the "<path>" portion, this option should be true.
   bool ignore_path_parameters_in_path_matching = 15;
+
+  // The typed_per_filter_config field can be used to provide RouteConfiguration level per filter config.
+  // The key should match the :ref:`filter config name
+  // <envoy_v3_api_field_extensions.filters.network.http_connection_manager.v3.HttpFilter.name>`.
+  // The canonical filter name (e.g., ``envoy.filters.http.buffer`` for the HTTP buffer filter) can also
+  // be used for the backwards compatibility. If there is no entry referred by the filter config name, the
+  // entry referred by the canonical filter name will be provided to the filters as fallback.
+  //
+  // Use of this field is filter specific;
+  // see the :ref:`HTTP filter documentation <config_http_filters>` for if and how it is utilized.
+  // [#comment: An entry's value may be wrapped in a
+  // :ref:`FilterConfig<envoy_v3_api_msg_config.route.v3.FilterConfig>`
+  // message to specify additional options.]
+  map<string, google.protobuf.Any> typed_per_filter_config = 16;
 }
 
 message Vhds {