GH-9636 plugins api GetUsersInChannelByStatus (#9645)

* adds GetUsersInChannelByStatus to plugin api with generated rpc code.

* fixed typo in comment with actual func name

* replaced Response model with AppError in output of GetUsersInChannelByStatus

* removed etag param from GetUsersInChannelByStatus since it is not used

* plugin api for GetUsersInChannelByStatus updated to take the limit, conforming to the app api.

* fixed an issue in my own logic on app/plugin integration.

* adds GetUsersInChannelByStatus to plugin api with generated rpc code.

* fixed typo in comment with actual func name

* replaced Response model with AppError in output of GetUsersInChannelByStatus

* removed etag param from GetUsersInChannelByStatus since it is not used

* plugin api for GetUsersInChannelByStatus updated to take the limit, conforming to the app api.

* fixed an issue in my own logic on app/plugin integration.

* GetUsersInChannelByStatus changed to more generic GetUsersInChannel which takes a sortBy parameter, allowing for more granular/extensible sorting functionality in the future

* GetUsersInChannel accepts sort parameter of 'username' and 'status'. Both values are consts in model pkg.

* Documents minimum server version for GetUsersInChannel.

* adds GetUsersInChannelByStatus to plugin api with generated rpc code.

* fixed typo in comment with actual func name

* replaced Response model with AppError in output of GetUsersInChannelByStatus

* removed etag param from GetUsersInChannelByStatus since it is not used

* plugin api for GetUsersInChannelByStatus updated to take the limit, conforming to the app api.

* fixed an issue in my own logic on app/plugin integration.

* adds GetUsersInChannelByStatus to plugin api with generated rpc code.

* Resolved conflict on rebase

* replaced Response model with AppError in output of GetUsersInChannelByStatus

* removed etag param from GetUsersInChannelByStatus since it is not used

* plugin api for GetUsersInChannelByStatus updated to take the limit, conforming to the app api.

* fixed an issue in my own logic on app/plugin integration.

* GetUsersInChannelByStatus changed to more generic GetUsersInChannel which takes a sortBy parameter, allowing for more granular/extensible sorting functionality in the future

* GetUsersInChannel accepts sort parameter of 'username' and 'status'. Both values are consts in model pkg.

* Documents minimum server version for GetUsersInChannel.

* replaces GetUsersInChannel from #9608 / #9643 with sortBy functionality

model/channel.go

@@ -29,6 +29,9 @@ const (
 	CHANNEL_HEADER_MAX_RUNES       = 1024
 	CHANNEL_PURPOSE_MAX_RUNES      = 250
 	CHANNEL_CACHE_SIZE             = 25000
+
+	CHANNEL_SORT_BY_USERNAME = "username"
+	CHANNEL_SORT_BY_STATUS   = "status"
 )
 
 type Channel struct {