[MM-34076] Add Plugin API User custom status (#17435)

* add missing client for custom user status

* add custom user status plugin api

* update based on feedback review

* add GetCustomStatus

* update interfaces

plugin/api.go

@@ -257,6 +257,19 @@ type API interface {
 	// Minimum server version: 5.8
 	UpdateUserActive(userID string, active bool) *model.AppError
 
+	// UpdateUserCustomStatus will set a user's custom status until the user, or another integration/plugin, clear it or update the custom status.
+	// The custom status have two parameters: emoji icon and custom text.
+	//
+	// @tag User
+	// Minimum server version: 5.36
+	UpdateUserCustomStatus(userID string, customStatus *model.CustomStatus) *model.AppError
+
+	// RemoveUserCustomStatus will remove a user's custom status.
+	//
+	// @tag User
+	// Minimum server version: 5.36
+	RemoveUserCustomStatus(userID string) *model.AppError
+
 	// GetUsersInChannel returns a page of users in a channel. Page counting starts at 0.
 	// The sortBy parameter can be: "username" or "status".
 	//