Add an 'from all' modifier for relations

[aaguiarz]

In some cases, you want to make sure that user has a relation to every instance of another relation.

For example, Assume you have a recording of a meeting and an employee shall be able to view this resource, if he/she was a participant of the meeting or is the boss of all those employees.

type employee
  relations
    define boss: [employee]
 
type recording_of_meeting
  relations
    define participant_of_meeting: [employee]
    define can_access: participant_of_meeting or boss from participant_of_meeting

It would be useful to be able to define the relation as:

type employee
  relations
    define boss: [employee]
 
type recording_of_meeting
  relations
    define participant_of_meeting: [employee]
    define can_access: participant_of_meeting or boss from all participant_of_meeting

In that case we'll check if the employee is the boss of all participants.

https://github.com/orgs/openfga/discussions/400
openfga/openfga#2156

[wbcustc]

We are blocked by this and have to change to use spiceDB because of the lack of from all support.
Really appreciate if we can get this feature supported soon.