HaikuDepot: Password Requirements

Obtains HDS's password requirements and displays
those to the user when creating a new account.

Relates to #13986

Change-Id: I1b76181e17bc03e9baf915dadcd3c45f9eb89b3f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6203
Tested-by: Automation <automation@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>