Changes to Create a speech

added the new optional request property language

added the new optional request property normalize

added the new optional request property timestamps

the input request property's maxLength was increased from 5000 to 50000

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

added the optional property error/code to the response with the 400 status

added the optional property error/code to the response with the 401 status

added the optional property error/param to the response with the 400 status

added the optional property error/param to the response with the 401 status