Remove ancillary methods.

[delucchi-cmu]

Part of #1013

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Before [2a30329] <v0.6.5>	After [f9d29ef]	Ratio	Benchmark (Parameter)
76.7±2ms	78.8±1ms	1.03	benchmarks.time_kdtree_crossmatch
36.1±0.6ms	36.7±0.7ms	1.02	benchmarks.time_polygon_search
23.1±0.1ms	23.4±0.4ms	1.01	benchmarks.time_box_filter_on_partition
884±4ms	882±2ms	1	benchmarks.time_create_midsize_catalog
5.92±0.01s	5.84±0.05s	0.99	benchmarks.time_create_large_catalog

Click here to view all benchmarks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.00%. Comparing base (2a30329) to head (3535c70).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1027      +/-   ##
==========================================
- Coverage   97.05%   97.00%   -0.05%     
==========================================
  Files          55       55              
  Lines        2712     2668      -44     
==========================================
- Hits         2632     2588      -44     
  Misses         80       80              

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