feat!: remove legacy REST

CHANGELOG.md

@@ -53,6 +53,14 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#9246](https://github.com/cosmos/cosmos-sdk/pull/9246) The `New` method for the network package now returns an error.
 * (codec) [\#9521](https://github.com/cosmos/cosmos-sdk/pull/9521) Removed deprecated `clientCtx.JSONCodec` from `client.Context`.
 * (codec) [\#9521](https://github.com/cosmos/cosmos-sdk/pull/9521) Rename `EncodingConfig.Marshaler` to `Codec`.
+* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) `RESTHandlerFn` argument is removed from the `gov/NewProposalHandler`.
+* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) `types/rest` package moved to `testutil/rest`.
+
+
+### Client Breaking Changes
+
+* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) Remove legacy REST API. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/master/migrations/rest.html) to migrate to the new REST endpoints.
+
 
 ### CLI Breaking Changes
 

client/docs/config.json

@@ -1,17 +1,11 @@
 {
   "swagger": "2.0",
   "info": {
-    "title": "Cosmos SDK - Legacy REST and gRPC Gateway docs",
-    "description": "A REST interface for state queries, legacy transactions",
+    "title": "Cosmos SDK - gRPC Gateway docs",
+    "description": "A REST interface for state queries",
     "version": "1.0.0"
   },
   "apis": [
-    {
-      "url": "./client/docs/swagger_legacy.yaml",
-      "dereference": {
-        "circular": "ignore"
-      }
-    },
     {
       "url": "./tmp-swagger-gen/cosmos/auth/v1beta1/query.swagger.json",
       "operationIds": {