Changes to Invite an external member into the agent-fs shared org

added the non-success response with the status 403

added the optional property acceptUrl to the response with the 200 status

added the optional property expiresAt to the response with the 200 status

added the optional property inviteId to the response with the 200 status

added the required property status to the response with the 200 status

added the media type application/json for the response with the status 200

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 500

endpoint added