Anonymous restricted automatic access for gateways

For AMOSgateway we want an anonymous restricted access to any user for limited amount to time before admins can move them to regular gateway user group. The restriction should be in limiting number of cores/nodes and wall time they can use as anonymous users.

Start by clarifying how anonymous users reach AMOSgateway and how administrators move them into the regular gateway user group. Define the limits for anonymous users—cores or nodes and wall time—and establish how completion will verify that those restrictions and the transition work as intended.

Written by the indexing model from the issue text.