Vizlib Server Cloud - allow to use Space in security Rules

Hello Vizlib, 

When working with security rules in the server version of the Cloud, we can only use user related context to set the rules, such as username, ID, Group, email or role.

This becomes limited to deploy at a large scale, for example if you a dedicated spaces where all members are meant to be writeback you are forced  to create an entry in the rule user by user.

Also taking into consideration that our IDP does not allow custom groups creation, therefore the only choice is to create an huge rule to include all writeback users.

It would be helpfull to be able to leverage other properties from the Qlik API, such as members of a space.

Thank you