[MM-58745] export/import: enable exporting and importing bots canonically (#28214)

server/channels/store/store.go

@@ -497,7 +497,9 @@ type UserStore interface {
 
 type BotStore interface {
 	Get(userID string, includeDeleted bool) (*model.Bot, error)
+	GetByUsername(username string) (*model.Bot, error)
 	GetAll(options *model.BotGetOptions) ([]*model.Bot, error)
+	GetAllAfter(limit int, afterId string) ([]*model.Bot, error)
 	Save(bot *model.Bot) (*model.Bot, error)
 	Update(bot *model.Bot) (*model.Bot, error)
 	PermanentDelete(userID string) error