Link attendees to speakers

As attendees can be associated with speakers directly, we have to update appuser for the same.

appuserid is needed for this along with speakerid. eventid is always mandatory.

Request Body speakerid is sent here as speakeridfk.
resources object[] eventid integer — REQUIRED appuserid integer — REQUIRED speakeridfk integer

Responses
200 PostPatchResponse Schema object[] id integer
default Error Response Schema code int32 Error code. message string String description of the error.