Gh-3277: Add custom GafferPop Vertex Step

[p29876]

Add a fold step before each vertex step to collect all vertex ids so the input to the new VertexStep is a list rather than single ids. This means we can do a single Gaffer query for all ids.

Note: input seeds are essentially deduped so expected output may change

Related issue

• Resolve GafferPop should 'squash' GetElements Operations #3277

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.73%. Comparing base (ce06bdf) to head (1689eab).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...tinkerpop/process/traversal/step/LazyFoldStep.java	83.33%	1 Missing and 1 partial ⚠️
...op/process/traversal/step/GafferPopVertexStep.java	98.03%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3278      +/-   ##
=============================================
+ Coverage      67.66%   67.73%   +0.07%     
  Complexity      2594     2594              
=============================================
  Files            942      945       +3     
  Lines          30070    30148      +78     
  Branches        3321     3328       +7     
=============================================
+ Hits           20346    20421      +75     
- Misses          8262     8263       +1     
- Partials        1462     1464       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud