thrift: deprecate twitter/finagle protocol (#20471)

This begins the deprecation process for TTwitter.

Fixes #20466.

Signed-off-by: Raul Gutierrez Segales <rgs@pinterest.com>

Mirrored from https://github.com/envoyproxy/envoy @ 9e67f1e2461e965c0269c69356d608e39c23902b

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

@@ -6,6 +6,7 @@ licenses(["notice"])  # Apache 2
 
 api_proto_package(
     deps = [
+        "//envoy/annotations:pkg",
         "//envoy/config/core/v3:pkg",
         "//envoy/config/route/v3:pkg",
         "@com_github_cncf_udpa//udpa/annotations:pkg",

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

@@ -8,6 +8,7 @@ import "envoy/extensions/filters/network/thrift_proxy/v3/route.proto";
 import "google/protobuf/any.proto";
 import "google/protobuf/wrappers.proto";
 
+import "envoy/annotations/deprecation.proto";
 import "udpa/annotations/migrate.proto";
 import "udpa/annotations/status.proto";
 import "udpa/annotations/versioning.proto";
@@ -58,7 +59,7 @@ enum ProtocolType {
   COMPACT = 3;
 
   // The Thrift proxy will use the Thrift "Twitter" protocol implemented by the finagle library.
-  TWITTER = 4;
+  TWITTER = 4 [deprecated = true, (envoy.annotations.deprecated_at_minor_version_enum) = "3.0"];
 }
 
 message Trds {