[ShapeUp] Initial support spaces which group together other Renku entities

[ciyer]

Pitch on Notion

🤔 Problem

As a project responsible, I would like to be able to group together multiple repositories so that I can structure my project into multiple repositories.

🚞 User stories / journeys

• As a user of RenkuLab, I want to be able to create a space with a name and description
• As a user of RenkuLab, I want to be able to control visibility of the space and give users access to the space
• As a user of RenkuLab, I want to be able to associate repositories to a space

[rokroskar]

this has been completed