Reverse geocoder with Lucene

[tovbinm]

Related issues
#154

Describe the proposed solution
Reverse geocoder implementation with Lucene index with GeohashPrefixTree and RecursivePrefixTreeStrategy.

TBD

Describe alternatives you've considered
TBD

[codecov]

Codecov Report

Merging #227 into master will increase coverage by 7.36%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
+ Coverage    79.1%   86.46%   +7.36%     
==========================================
  Files         312      313       +1     
  Lines       10183    10253      +70     
  Branches      335      558     +223     
==========================================
+ Hits         8055     8865     +810     
+ Misses       2128     1388     -740

Impacted Files	Coverage Δ
...a/com/salesforce/op/utils/text/OpenNLPModels.scala	97.61% <ø> (ø)	⬆️
...main/scala/com/salesforce/op/test/TestCommon.scala	52.63% <100%> (+2.63%)	⬆️
...alesforce/op/utils/geo/LuceneReverseGeocoder.scala	95.65% <95.65%> (ø)
...op/stages/impl/regression/OpXGBoostRegressor.scala	18.18% <0%> (+2.27%)	⬆️
...p/evaluators/OpBinaryClassificationEvaluator.scala	82.5% <0%> (+2.5%)	⬆️
.../main/scala/com/salesforce/op/OpWorkflowCore.scala	93.54% <0%> (+3.22%)	⬆️
...ala/com/salesforce/op/dsl/RichNumericFeature.scala	100% <0%> (+3.75%)	⬆️
...main/scala/com/salesforce/op/OpWorkflowModel.scala	92.85% <0%> (+4.28%)	⬆️
...scala/com/salesforce/op/testkit/RandomStream.scala	100% <0%> (+4.76%)	⬆️
... and 52 more

---

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[codecov]

Codecov Report

Merging #227 into master will decrease coverage by 27.12%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           master     #227       +/-   ##
===========================================
- Coverage   86.39%   59.27%   -27.13%     
===========================================
  Files         312      313        +1     
  Lines       10182    10252       +70     
  Branches      333      559      +226     
===========================================
- Hits         8797     6077     -2720     
- Misses       1385     4175     +2790

Impacted Files	Coverage Δ
...a/com/salesforce/op/utils/text/OpenNLPModels.scala	97.61% <ø> (ø)	⬆️
...alesforce/op/utils/geo/LuceneReverseGeocoder.scala	0% <0%> (ø)
...sforce/op/stages/base/binary/BinaryEstimator.scala	0% <0%> (-100%)	⬇️
...ce/op/stages/impl/feature/TextLenTransformer.scala	0% <0%> (-100%)	⬇️
...n/scala/com/salesforce/op/readers/CSVReaders.scala	0% <0%> (-100%)	⬇️
...stages/base/sequence/BinarySequenceEstimator.scala	0% <0%> (-100%)	⬇️
.../scala/com/salesforce/op/readers/CSVDefaults.scala	0% <0%> (-100%)	⬇️
...lesforce/op/stages/impl/feature/LangDetector.scala	0% <0%> (-100%)	⬇️
...sql/execution/datasources/csv/CSVSchemaUtils.scala	0% <0%> (-100%)	⬇️
...alesforce/op/cli/gen/templates/SimpleProject.scala	0% <0%> (-100%)	⬇️
... and 142 more

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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