Self Scheduling API - Add API for self schedule invites update and requesting reschedule

Description

Extending Self Scheduling API by adding endpoints:

POST /automated-self-schedules/update-invite - For updating pending self-schedule invites for automated self-schedules.
Link to the self-schedule invite would stay the same, but the invite would be updated with new information.
Pending invites are those that have not been accepted by the candidate by selecting an interview time slot.
POST /automated-self-schedules/reschedule - For requesting self-reschedule from a candidate.
Previous self-scheduled interview would be canceled.
Existing self-schedule invites will be updated to allow the candidate to select a new time slot, which will be created as a new interview.
Link to the self-schedule invite would stay the same.
GET /self-schedules/{id}/application/{applicationUuid}/interview - For getting the interview details for a self-scheduled interview.

This enhancement is backward-compatible and does not require any changes to existing client implementations.