Draft : feat(GIST-78): added ABAC on gists

[Courtcircuits]

This PR implements ABAC for gists

WARNING : It hasn't been tested yet and this PR can potentially to a leak of confidential user data. Please review it carefully before merging + wait for the addition of tests.

• also need rollback migration script IF it goes wrong in production

[linear]

GIST-78 Manage access rights on gists

We need to add access rights on some gists :

• read
  • if gist is public, anyone
  • if gist is private, you need to specify whether a user can read/write a gist
• update (which is writing, basically)
  • if gist is public, need to give the right to write
  • if gist is private, same as read

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