GH-9608: Add GetUsersInChannel to plugin API (#9643)

* add GetUsersInChannel to plugin api

* compute offset value instead of page

* Add version comment

plugin/client_rpc_generated.go

@@ -1899,6 +1899,37 @@ func (s *apiRPCServer) DeleteChannelMember(args *Z_DeleteChannelMemberArgs, retu
 	return nil
 }
 
+type Z_GetUsersInChannelArgs struct {
+	A string
+	B int
+	C int
+}
+
+type Z_GetUsersInChannelReturns struct {
+	A []*model.User
+	B *model.AppError
+}
+
+func (g *apiRPCClient) GetUsersInChannel(channelId string, page int, perPage int) ([]*model.User, *model.AppError) {
+	_args := &Z_GetUsersInChannelArgs{channelId, page, perPage}
+	_returns := &Z_GetUsersInChannelReturns{}
+	if err := g.client.Call("Plugin.GetUsersInChannel", _args, _returns); err != nil {
+		log.Printf("RPC call to GetUsersInChannel API failed: %s", err.Error())
+	}
+	return _returns.A, _returns.B
+}
+
+func (s *apiRPCServer) GetUsersInChannel(args *Z_GetUsersInChannelArgs, returns *Z_GetUsersInChannelReturns) error {
+	if hook, ok := s.impl.(interface {
+		GetUsersInChannel(channelId string, page int, perPage int) ([]*model.User, *model.AppError)
+	}); ok {
+		returns.A, returns.B = hook.GetUsersInChannel(args.A, args.B, args.C)
+	} else {
+		return encodableError(fmt.Errorf("API GetUsersInChannel called but not implemented."))
+	}
+	return nil
+}
+
 type Z_CreatePostArgs struct {
 	A *model.Post
 }