adding memory and disk usage stats to bench tests

[MarkWolters]

This PR adds new columns to the BenchYAML tests measuring memory and disk usage. The output looks as follows:

Configuration:
  efConstruction        : 100
  addHierarchy          : true
  neighborOverflow      : 1.2
  usePruning            : true
  M                     : 32

Overquery    Avg QPS (of 3)    ± Std Dev    CV %        Mean Latency (ms)    Avg Visited    Recall@10    Max heap usage    Max offheap usage    Total file size    Number of files    Index build time   
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1.00         45799.0           706.6        1.5         0.192                349.6          0.75         1127.6            116.5                116.5              1                  38.72              
2.00         38702.6           344.8        0.9         0.237                507.2          0.89         494.1             116.5                116.5              1                  38.72              
5.00         25087.6           463.2        1.8         0.363                922.1          0.95         795.4             116.5                116.5              1                  38.72              
10.00        16557.8           45.5         0.3         0.551                1512.0         0.97         1219.3            116.5                116.5              1                  38.72         

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[jshook]

I've approved this, but please see my comments regarding notify. I think you might have a better way to implement this which is well supported and much more efficient.

[marianotepper]

LGTM

[tlwillke]

LGTM