Enable Python profiling for StreamingPythonScriptExecutor.

[cmnbroad]

Fixes #4766. We might want to do a similar thing for the non-streaming executor, in a separate PR.

[codecov-io]

Codecov Report

Merging #4953 into master will increase coverage by 0.001%.
The diff coverage is 93.333%.

@@               Coverage Diff               @@
##              master     #4953       +/-   ##
===============================================
+ Coverage     86.387%   86.388%   +0.001%     
- Complexity     28846     28849        +3     
===============================================
  Files           1791      1791               
  Lines         133626    133653       +27     
  Branches       14921     14925        +4     
===============================================
+ Hits          115435    115460       +25     
  Misses         12793     12793               
- Partials        5398      5400        +2

Impacted Files	Coverage Δ	Complexity Δ
...er/utils/python/StreamingPythonScriptExecutor.java	86.957% <100%> (+1.38%)	22 <5> (+2)	⬆️
...ellbender/tools/walkers/vqsr/CNNScoreVariants.java	74.757% <100%> (ø)	40 <0> (ø)	⬇️
.../python/StreamingPythonScriptExecutorUnitTest.java	86.4% <88.235%> (+0.161%)	16 <1> (+1)	⬆️

[droazen]

@jonn-smith and @lucidtronix please review when you get a chance. Thanks!

[jonn-smith]

This seems pretty good to me.

I haven't done a lot of python profiling - do we want to make the profiling have some options? If so, it can be a separate PR.

[cmnbroad]

@jonn-smith Yes, I think if this turns out to be useful, we may want to add more options, i.e. which stats to collect, but I think we'll have to use it a bit to figure out which ones.