Live updates on Space/subspace pages (subscriptions)

[SimoneZaza]

Description

As a user, I want to immediately see a newly posted contribution, without the need to refresh.

Acceptance criteria

5 subscriptions on the server, need to be wired on the client

• Callout created/edited/deleted
• Comment created/edited/deleted
• Post in call for posts created/deleted
• Whiteboard in call for whiteboards created/deleted
• Subspace created/deleted
  on
• Space - Dashboard
• Space - Community
• Space - Subspaces
• Space - Knowledge base
• Subspace l1
• Subspace l2

Additional Context

Screen shots / UX designs / data that are relevant.

Areas that will be affected

To be added during the refinement