xds: enable udpa.TypeStruct

[zirain]

This patch enable us to use configuration as following:

apiVersion: gateway.envoyproxy.io/v1alpha1
kind: EnvoyPatchPolicy
metadata:
  name: envoy-lua-filter
spec:
  targetRef:
    group: gateway.networking.k8s.io
    kind: Gateway
    name: eg
  type: JSONPatch
  jsonPatches:
    - type: "type.googleapis.com/envoy.config.listener.v3.Listener"
      # The listener name is of the form <GatewayNamespace>/<GatewayName>/<GatewayListenerName>
      name: default/eg/http
      operation:
        op: add
        path: "/default_filter_chain/filters/0/typed_config/http_filters/0"
        value:
          name: "envoy.lua"
          typedConfig:
            "@type": type.googleapis.com/udpa.type.v1.TypedStruct
            typeUrl: type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
            value:
              inline_code: |
                function envoy_on_request(request_handle)
                  -- Make an HTTP call to an upstream host with the following headers, body, and timeout.
                  val = request_handle:headers():get("key1")
                  request_handle:logWarn("get result: " .. val)
                end

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.59%. Comparing base (9219f82) to head (76d4008).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6311      +/-   ##
==========================================
+ Coverage   70.56%   70.59%   +0.03%     
==========================================
  Files         220      220              
  Lines       36829    36829              
==========================================
+ Hits        25989    26001      +12     
+ Misses       9302     9295       -7     
+ Partials     1538     1533       -5     

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[arkodg]

LGTM thanks !