fix: add cosmos_proto.implements_interface (backport cosmos#1740) (cosmos#1815)

* fix: add cosmos_proto.implements_interface (cosmos#1740)

* fix: add cosmos_proto.implements_interface

* changelog

* Update CHANGELOG.md

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

* run `make proto-all`

* run `go mod tidy`

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>
(cherry picked from commit 40d0ff7)

* fix conflicts

Co-authored-by: Dan Lynch <pyramation@gmail.com>
Co-authored-by: crodriguezvega <carlos@interchain.io>

Author: 3 people

proto/ibc/core/client/v1/client.proto

@@ -7,6 +7,7 @@ option go_package = "github.com/line/ibc-go/v3/modules/core/02-client/types";
 import "gogoproto/gogo.proto";
 import "google/protobuf/any.proto";
 import "cosmos/upgrade/v1beta1/upgrade.proto";
+import "cosmos_proto/cosmos.proto";
 
 // IdentifiedClientState defines a client state with an additional client
 // identifier field.
@@ -41,7 +42,8 @@ message ClientConsensusStates {
 // handler may fail if the subject and the substitute do not match in client and
 // chain parameters (with exception to latest height, frozen height, and chain-id).
 message ClientUpdateProposal {
-  option (gogoproto.goproto_getters) = false;
+  option (gogoproto.goproto_getters)         = false;
+  option (cosmos_proto.implements_interface) = "cosmos.gov.v1beta1.Content";
   // the title of the update proposal
   string title = 1;
   // the description of the proposal
@@ -56,9 +58,10 @@ message ClientUpdateProposal {
 // UpgradeProposal is a gov Content type for initiating an IBC breaking
 // upgrade.
 message UpgradeProposal {
-  option (gogoproto.goproto_getters)  = false;
-  option (gogoproto.goproto_stringer) = false;
-  option (gogoproto.equal)            = true;
+  option (gogoproto.goproto_getters)         = false;
+  option (gogoproto.goproto_stringer)        = false;
+  option (gogoproto.equal)                   = true;
+  option (cosmos_proto.implements_interface) = "cosmos.gov.v1beta1.Content";
 
   string                      title       = 1;
   string                      description = 2;