As an event organizer, I want the invitation list to be generated and stored when I submit information into the form, so that it can identify audiences who may be good candidates to invite to my event.
**Background: **This ticket focuses on the actual storage of the invitation list in the database. The UI of the organizer inputting the information to generate the invitation list is handled by T356679, while the UI for handling the invitation list results is handled by T364804. The pending state after the request has been issued will be handled in T364802. The work to refactor the invitation list (T365628) and to set up the general storage of the invitation lists (T366633) will also be handled separately.
**Testing notes: **This will be testable either by querying the DB or going to SpecialInvitationList, depending on whether the SpecialInvitationList page is implemented in time.
**Acceptance Criteria:**
* Given that a user has submitted a valid invitation list name and worklist on Special:GenerateInvitationList,
** Then an invitation list should be generated
*** And the invitation list should be stored in the DB