Migrate polygon search to use mocpy utilities

[camposandro]

Migrate polygon pixel filtering to use MOC.from_polygon_skycoord instead of healpy.query_polygon. This change adds some more polygon validation (borrowed from HEALpy) to make sure the polygon is convex, which is a requirement for lsst.sphgeom. Closes #402.

Code Quality

• I have read the Contribution Guide
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.02%. Comparing base (17ec4ac) to head (98bc347).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #415      +/-   ##
==========================================
+ Coverage   92.99%   93.02%   +0.03%     
==========================================
  Files          49       47       -2     
  Lines        2127     2122       -5     
==========================================
- Hits         1978     1974       -4     
+ Misses        149      148       -1     

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[github-actions]

Before [17ec4ac] <v0.4.3>	After [d8baa5f]	Ratio	Benchmark (Parameter)
13.8±0.9ms	15.7±0.4ms	~1.14	benchmarks.Suite.time_inner_pixel_alignment
110±1ms	110±0.8ms	1.01	benchmarks.Suite.time_paths_creation
23.1±0.3ms	23.1±0.3ms	1.00	benchmarks.MetadataSuite.time_load_partition_info_order6
93.7±0.4ms	93.4±0.3ms	1.00	benchmarks.MetadataSuite.time_load_partition_join_info
382±4ms	381±2ms	1.00	benchmarks.Suite.time_outer_pixel_alignment
46.6±0.5ms	46.6±0.4ms	1.00	benchmarks.Suite.time_pixel_tree_creation
125±1ms	125±0.7ms	1.00	benchmarks.time_test_alignment_even_sky
1.03±0.03ms	1.02±0.03ms	1.00	benchmarks.time_test_cone_filter_multiple_order
94.4±0.6ms	93.0±0.4ms	0.99	benchmarks.MetadataSuite.time_load_partition_info_order7

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