Personal Sessions: add create, list, get, revoke Admin APIs

[reivilibre]

Follows: #5106
Part of: #4492

This PR introduces some admin API endpoints for Personal Sessions.

• add: Creates a personal session along with its first personal access token, returning both. This is currently the only way to get a personal access token.
• get: Shows the information about a personal session
• list: Shows many personal sessions
• revoke: Revokes a personal session, so it can't be used anymore

Future:

• regenerate: Revoke the active personal access token for a session and issue a new one to replace it.

Open question/thought I have: It seems like it would be good to bundle information about the active access token for each session, in the get and list endpoints.
For instance, I might want to filter on 'sessions with expired access tokens', or I might want to see the expiry time at a glance in the session list, or even sort by that time.
Wondering what your thoughts are on exposing that?

Should the relevant access token be embedded in attributes as a nested object?:

        {
          "data": {
            "type": "personal-session",
            "id": "01FSHN9AG0AJ6AC5HQ9X6H4RP4",
            "attributes": {
              "created_at": "2022-01-16T14:40:00Z",
              "revoked_at": null,
              "owner_user_id": "01FSHN9AG0MZAA6S4AF7CTV32E",
              "owner_client_id": null,
              "actor_user_id": "01FSHN9AG0MZAA6S4AF7CTV32E",
              "human_name": "Test session",
              "scope": "openid",
              "last_active_at": null,
              "last_active_ip": null,
              "access_token": {
                  "type": "personal-access-token",
                  "id": "XXXX",
                  "attributes": {
                    // ...
                    "expires_at": "..."
                  }
                }
            },
            "links": {
              "self": "/api/admin/v1/personal-sessions/01FSHN9AG0AJ6AC5HQ9X6H4RP4"
            }
          },
          "links": {
            "self": "/api/admin/v1/personal-sessions/01FSHN9AG0AJ6AC5HQ9X6H4RP4"
          }
        }

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