SpaceAbout for all about information access

[techsmyth]

Description

As a user I want a robust application
As a developer I want a clean conceptual model that is easy to maintain

Acceptance criteria

• Extend SpaceAbout entity to provide all information about a private space that a non-member should be able to access: myRoles, application form, privileges to apply / join, ???
• Add mutations to allow joining / applying to a space not via roleset
• Update authorization to that if a user can see the Space, then the user has READ privilege on SpaceAbout that cascades. Remove all privilege rules that grant READ_ABOUT to READ within Profile entity tree. Grant READ_ABOUT on Space, not in any other place.

Additional Context

Part of this work, the api extensions, could be done without impacting the client, and then the client could be updated to use the new api.

The authorization related work will require client updates.
Screen shots / UX designs / data that are relevant.

Areas that will be affected

To be added during the refinement