Add --split-queries option to export-pg-from-queries

[Cole-Greer]

Issue #, if available: N/A

Description of changes:

Add a new --split-queries CLI arg to queries exports which inject range() steps into the start of queries according to a RangeConfig and ConcurrencyConfig in order to run queries concurrently.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (f20eaf1) 44.81% compared to head (3589cf1) 45.53%.

Files	Patch %	Lines
...neptune/ExportPropertyGraphFromGremlinQueries.java	0.00%	7 Missing ⚠️
...propertygraph/LazyQueriesRangeFactoryProvider.java	80.00%	4 Missing and 2 partials ⚠️
...s/services/neptune/propertygraph/NamedQueries.java	87.50%	0 Missing and 3 partials ⚠️
...ws/services/neptune/propertygraph/EdgesClient.java	0.00%	1 Missing and 1 partial ⚠️
...ws/services/neptune/propertygraph/NodesClient.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #105      +/-   ##
===========================================
+ Coverage    44.81%   45.53%   +0.71%     
===========================================
  Files          247      248       +1     
  Lines         8550     8618      +68     
  Branches       881      893      +12     
===========================================
+ Hits          3832     3924      +92     
+ Misses        4423     4392      -31     
- Partials       295      302       +7     

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[vkagamlyk]

LGTM

[xiazcy]

LGTM. One minor comment.
Do we have any performance data on how using --split-queries improves compared to not using it? Is there caveat with using this option that we should highlight in the docs? I.e. "recommended to use this for xxx"?
I think you've added great features and many new options, so it might be helpful to have a section of the docs that gives pointer to why and how to use them.

[Cole-Greer]

LGTM. One minor comment. Do we have any performance data on how using --split-queries improves compared to not using it? Is there caveat with using this option that we should highlight in the docs? I.e. "recommended to use this for xxx"? I think you've added great features and many new options, so it might be helpful to have a section of the docs that gives pointer to why and how to use them.

I will add some additional documentation to appropriate sections of the readme.