Changes to Create a batch

added the new required request property attributes

added the new required request property billing_project

request body became required

added the new optional request property callback

added the new optional request property cancel_after_n_failures

added the new optional request property token

removed the request property attributes

removed the request property billing_project

removed the request property callback

removed the request property cancel_after_n_failures

removed the request property token

request body became optional