Bring back TaskRecording and other minor fixes

[rly]

• Brings back TaskRecording which was accidentally removed in #37
• Removes the duration column for now while we replace it with a DurationVectorData type
• Removes required name for Task.TaskProgram and Task.TaskSchema which is overly restrictive IMO and caused validation errors in the tests
• Auto-generate Task and TaskRecording neurodata types which are relatively simple.
• Confirms that tests pass and the notebook runs without error