Missing options from gh pr create to add metadata to PRs

[JakeWharton]

I would expect similar options to that of gh pr create such as:

-a, --assignee login       Assign people by their login. Use "@me" to self-assign.
-l, --label name           Add labels by name
-m, --milestone name       Add the pull request to a milestone by name
-p, --project title        Add the pull request to projects by title
-r, --reviewer handle      Request reviews from people or teams by their handle

Also while --draft Create PRs as drafts is an option, gh pr create also allows the shortened -d.