feat: Timestamp subtraction, epoch extraction from intervals #8346
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This updates a git commit pointer to arrow-datafusion for cube-js/arrow-datafusion#158 and adds tests.
Some test values are rendered pretty screwily because of another bug outside the scope of this feature, involving formatting in IntervalValue::as_postgresql_str and misconstructed IntervalValues in batch_to_dataframe. That needs to be fixed but is seemingly a separate issue.
Edit: The test values will be fixed in the branch interval-rendering.