Add option to sort comments

@kolaente Do you want to append the api path like this
/tasks/:task/comments/:order
where order might be “asc” or “desc”?

Or passing the order as a param:
comments.value = await taskCommentService.getAll({taskId}, {order: order})

I may need some hints on how to adapt the ReadAll() function inside task_comments.go.

I tried to simply add the order param to the function

func (tc *TaskComment) ReadAll(s *xorm.Session, auth web.Auth, search string, page int, perPage int, order string) (result interface{}, resultCount int, numberOfTotalItems int64, err error)

but this results in errors for the web/handler as ReadAll does not any more follow the pattern

want ReadAll(*xorm.Session, web.Auth, string, int, int) (interface{}, int, int64, error)

I implemented the frontend stuff here: andileni/vikunja: The to-do app to organize your life. Public API Roadmap here: - vikunja - Gitea