Migrate v2 thrift_filter to v3 api and corresponding docs changes. (#13885)

part of #12841

Signed-off-by: Abhay Narayan Katare <abhay.katare@india.nec.com>

Mirrored from https://github.com/envoyproxy/envoy @ 77d7cecb7e68cb41b2f5f7c2aa7f4294c88089ce

BUILD

@@ -231,6 +231,7 @@ proto_library(
         "//envoy/extensions/filters/network/sni_dynamic_forward_proxy/v3alpha:pkg",
         "//envoy/extensions/filters/network/tcp_proxy/v3:pkg",
         "//envoy/extensions/filters/network/thrift_proxy/filters/ratelimit/v3:pkg",
+        "//envoy/extensions/filters/network/thrift_proxy/router/v3:pkg",
         "//envoy/extensions/filters/network/thrift_proxy/v3:pkg",
         "//envoy/extensions/filters/network/wasm/v3:pkg",
         "//envoy/extensions/filters/network/zookeeper_proxy/v3:pkg",

envoy/extensions/filters/network/thrift_proxy/router/v3/BUILD

@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/config/filter/thrift/router/v2alpha1:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
+    ],
+)

envoy/extensions/filters/network/thrift_proxy/router/v3/router.proto

@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.network.thrift_proxy.router.v3;
+
+import "udpa/annotations/status.proto";
+import "udpa/annotations/versioning.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.filters.network.thrift_proxy.router.v3";
+option java_outer_classname = "RouterProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Router]
+// Thrift router :ref:`configuration overview <config_thrift_filters_router>`.
+// [#extension: envoy.filters.thrift.router]
+
+message Router {
+  option (udpa.annotations.versioning).previous_message_type =
+      "envoy.config.filter.thrift.router.v2alpha1.Router";
+}

versioning/BUILD

@@ -114,6 +114,7 @@ proto_library(
         "//envoy/extensions/filters/network/sni_dynamic_forward_proxy/v3alpha:pkg",
         "//envoy/extensions/filters/network/tcp_proxy/v3:pkg",
         "//envoy/extensions/filters/network/thrift_proxy/filters/ratelimit/v3:pkg",
+        "//envoy/extensions/filters/network/thrift_proxy/router/v3:pkg",
         "//envoy/extensions/filters/network/thrift_proxy/v3:pkg",
         "//envoy/extensions/filters/network/wasm/v3:pkg",
         "//envoy/extensions/filters/network/zookeeper_proxy/v3:pkg",