add memory and disk stats to regression tests

[MarkWolters]

This PR adds memory and disk stats to the regression tests run by autoBenchYAML as well as to the analysis and charts generated afterwards. Specifically the 3 new metrics collected for comparison are:

• max heap during index build phase
• max heap during query phase
• total disk size of monitored directories

This PR also adds the exact (to 2 decimal places) value of each point on the Y axis to make it easier to read and interpret the results.

[github-actions]

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