Allow nested column names in statistics methods

[camposandro]

Allow nested column names in include_columns and exclude_columns, for per_pixel_statistics and aggregate_column_statistics. For example, if "lightcurve" is a nested column, we can now specify include_columns=["lightcurve"] as well as exclude_columns=["lightcurve"].

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.49%. Comparing base (6081879) to head (a2610ef).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #625      +/-   ##
==========================================
+ Coverage   93.07%   93.49%   +0.42%     
==========================================
  Files          50       50              
  Lines        2367     2444      +77     
==========================================
+ Hits         2203     2285      +82     
+ Misses        164      159       -5     

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[github-actions]

Before [cce3f3a]	After [c4ce459]	Ratio	Benchmark (Parameter)
1.04±0.02ms	1.06±0.02ms	1.02	benchmarks.time_test_cone_filter_multiple_order
12.9±0.5ms	13.0±0.5ms	1.01	benchmarks.Suite.time_inner_pixel_alignment
400±4ms	404±1ms	1.01	benchmarks.Suite.time_outer_pixel_alignment
270±3ms	272±0.6ms	1.01	benchmarks.time_open_large_catalog
41.9±0.4ms	41.7±0.6ms	0.99	benchmarks.Suite.time_pixel_tree_creation
43.8±0.2ms	43.5±0.2ms	0.99	benchmarks.time_open_midsize_catalog
277±2ms	273±2ms	0.99	benchmarks.time_small_cone_large_catalog
123±2ms	123±0.7ms	0.99	benchmarks.time_test_alignment_even_sky

Click here to view all benchmarks.