Improve geocoding fuzziness, remove street corners

[leonardehrenfried]

Summary

@miles-grant-ibigroup has requested the following changes to the sandbox geocoder:

• Fuzziness is improved through a more elaborate query strategy
• An NGram index is added which allows also matches in the middle of a word so "exanderp" matches "Alexanderplatz"
• The stop clusters, which group stops with the same name, now have a larger radius from 10m to 100m.

Feature removal

This PR also removes the street corners from the geocoding index, which improves startup time. @flaktack, who originally added it, said that he would be fine if it was removed.

Unit tests

Lots added.

Documentation

Updated.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (00c0304) 66.59% compared to head (3dcbc98) 66.64%.
Report is 87 commits behind head on dev-2.x.

❗ Current head 3dcbc98 differs from pull request most recent head 2714adc. Consider uploading reports for the commit 2714adc to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #5401      +/-   ##
=============================================
+ Coverage      66.59%   66.64%   +0.05%     
- Complexity     15284    15290       +6     
=============================================
  Files           1790     1791       +1     
  Lines          69388    69389       +1     
  Branches        7308     7306       -2     
=============================================
+ Hits           46206    46244      +38     
+ Misses         20704    20668      -36     
+ Partials        2478     2477       -1     

Files	Coverage Δ
...tripplanner/ext/geocoder/EnglishNGramAnalyzer.java	100.00% <100.00%> (ø)
...pentripplanner/ext/geocoder/StopClusterMapper.java	96.55% <100.00%> (ø)
...ntripplanner/framework/geometry/WgsCoordinate.java	90.56% <100.00%> (+0.56%)	⬆️
...entripplanner/openstreetmap/model/OSMWithTags.java	88.73% <ø> (ø)
...opentripplanner/ext/geocoder/GeocoderResource.java	0.00% <0.00%> (ø)
.../org/opentripplanner/ext/geocoder/LuceneIndex.java	87.68% <91.66%> (+19.10%)	⬆️

... and 1 file with indirect coverage changes

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[leonardehrenfried]

Add test for rounding.

[leonardehrenfried]

@flaktack Could you perhaps review this?

[t2gran]

The NONE Sandbox changes look good! I have not looked at the code in the Sandbox.