JSON object that contains various groups of job configuration
parameters. Based on the value of type, a type-specific object
such as transcription_config is required to be present to
specify all configuration settings or parameters needed to
process the job inputs as expected.
If the results of the job are to be forwarded on completion,
notification_config can be provided with a list of callbacks
to be made; no assumptions should be made about the order in
which they will occur.
Customer specific job details or metadata can be supplied in
tracking, and this information will be available where
possible in the job results and in callbacks.
