Add Deprecation headers for legacy rest endpoints (#7686)

* add deprecation headers for legacy rest endpoints

* add deprecation headers for missing tx routes

* rm handler-level deprecation headers

* switch to middleware Route.Use method for setting deprecation Headers

* set deprecation headers using subrouter

* cleanup gofmt

* goimports

* Update client/rest/rest.go

* update deprecation headers to be set on each module individually

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

x/auth/client/rest/rest.go

@@ -4,6 +4,7 @@ import (
 	"github.com/gorilla/mux"
 
 	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/client/rest"
 )
 
 // REST query and parameter values
@@ -12,7 +13,8 @@ const (
 )
 
 // RegisterRoutes registers the auth module REST routes.
-func RegisterRoutes(clientCtx client.Context, r *mux.Router, storeName string) {
+func RegisterRoutes(clientCtx client.Context, rtr *mux.Router, storeName string) {
+	r := rest.WithHTTPDeprecationHeaders(rtr)
 	r.HandleFunc(
 		"/auth/accounts/{address}", QueryAccountRequestHandlerFn(storeName, clientCtx),
 	).Methods(MethodGet)
@@ -24,7 +26,8 @@ func RegisterRoutes(clientCtx client.Context, r *mux.Router, storeName string) {
 }
 
 // RegisterTxRoutes registers all transaction routes on the provided router.
-func RegisterTxRoutes(clientCtx client.Context, r *mux.Router) {
+func RegisterTxRoutes(clientCtx client.Context, rtr *mux.Router) {
+	r := rest.WithHTTPDeprecationHeaders(rtr)
 	r.HandleFunc("/txs/{hash}", QueryTxRequestHandlerFn(clientCtx)).Methods("GET")
 	r.HandleFunc("/txs", QueryTxsRequestHandlerFn(clientCtx)).Methods("GET")
 	r.HandleFunc("/txs", BroadcastTxRequest(clientCtx)).Methods("POST")