Correct pixel boundaries when plotting pixels at orders lower than 3 show

[smcguire-cmu]

Previously order 0-2 healpix were split to order 3 when plotting, showing incorrect borders. This adds the ability to plot lower order pixels with more steps along the edges, and correct borders.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.99%. Comparing base (f778966) to head (1ff39ad).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #413      +/-   ##
==========================================
+ Coverage   92.95%   92.99%   +0.03%     
==========================================
  Files          49       49              
  Lines        2116     2127      +11     
==========================================
+ Hits         1967     1978      +11     
  Misses        149      149              

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[github-actions]

Before [f778966]	After [1f0b9c4]	Ratio	Benchmark (Parameter)
22.5±0.2ms	23.0±0.2ms	1.02	benchmarks.MetadataSuite.time_load_partition_info_order6
13.4±1ms	13.5±1ms	1.01	benchmarks.Suite.time_inner_pixel_alignment
94.0±0.4ms	93.8±0.6ms	1	benchmarks.MetadataSuite.time_load_partition_info_order7
379±1ms	377±4ms	1	benchmarks.Suite.time_outer_pixel_alignment
110±1ms	110±0.5ms	1	benchmarks.Suite.time_paths_creation
45.5±0.2ms	45.5±0.09ms	1	benchmarks.Suite.time_pixel_tree_creation
125±0.6ms	125±0.4ms	1	benchmarks.time_test_alignment_even_sky
1.01±0.03ms	1.02±0.03ms	1	benchmarks.time_test_cone_filter_multiple_order
93.4±0.4ms	92.9±0.3ms	0.99	benchmarks.MetadataSuite.time_load_partition_join_info

Click here to view all benchmarks.

[camposandro]

Can you please add some comments to the unit test calculations as well?