Gh-2983: Re-add Gaffer tinkerpop code

[t92549]

Related Issue

• Resolve Move Gaffer TinkerPop code to core Gaffer #2983

[GCHQDeveloper314]

See comments. Various classes don't have any Javadoc, although some of these might inherit which may be ok.

[codecov]

Codecov Report

Merging #2984 (9cc8023) into develop (6dda8c8) will decrease coverage by 0.20%.
The diff coverage is 57.16%.

@@              Coverage Diff              @@
##             develop    #2984      +/-   ##
=============================================
- Coverage      65.35%   65.15%   -0.20%     
- Complexity      2510     2634     +124     
=============================================
  Files            885      901      +16     
  Lines          28197    28797     +600     
  Branches        3164     3238      +74     
=============================================
+ Hits           18429    18764     +335     
- Misses          8368     8576     +208     
- Partials        1400     1457      +57     

Impacted Files	Coverage Δ
...tinkerpop/generator/GafferPopElementGenerator.java	0.00% <0.00%> (ø)
...inkerpop/gremlinplugin/GafferPopGremlinPlugin.java	0.00% <0.00%> (ø)
...kerpop/service/GafferPopNamedOperationService.java	0.00% <0.00%> (ø)
...re/operation/impl/GetElementsBetweenSetsPairs.java	90.00% <ø> (-4.00%)	⬇️
...gchq/gaffer/tinkerpop/GafferPopVertexProperty.java	32.35% <32.35%> (ø)
.../gchq/gaffer/tinkerpop/GafferPopGraphFeatures.java	43.47% <43.47%> (ø)
...service/GafferPopNamedOperationServiceFactory.java	50.00% <50.00%> (ø)
...gchq/gaffer/tinkerpop/GafferPopGraphVariables.java	55.55% <55.55%> (ø)
...fer/tinkerpop/generator/GafferEntityGenerator.java	60.00% <60.00%> (ø)
...k/gov/gchq/gaffer/tinkerpop/GafferPopProperty.java	61.53% <61.53%> (ø)
... and 7 more

... and 1 file with indirect coverage changes