Show sub-subspaces in Space Explorer page

[ccanos]

Description

As an Alkemio user I want to explore deeper in the hierarchy through Space Explorer.

Acceptance criteria

• [ ] Space Explorer page should show subspaces inside subspaces no matter how deep in the tree

Additional Context

• At the moment the algorithm only digs up to sub-spaces (1st level deep).

• There is an attempt to implement recursive fetching in: https://github.com/alkem-io/client-web/pull/6129/commits/23aa8886a65b5673f6cc4d31982832a7692561dc

• The difficulty lays on the authorization, we need to know if we are able to read a space before fetching its subspaces.

Screen shots / UX designs / data that are relevant.

Areas that will be affected

To be added during the refinement

[bobbykolev]

Assigning this one to Simone for discussion.

[ccanos]

@Atlas Team , I think users are going to use the filters here a lot. can we use elastic for this?