Changes to Create socket session

header request parameter Idempotency-Key list-of-types was narrowed by removing types null

for the header request parameter Idempotency-Key, the minLength was increased from 0 to 1

for the header request parameter Idempotency-Key, the maxLength was set to 128

for the header request parameter Idempotency-Key, the type was generalized from no type to string

endpoint added