Include skymap in to_hats

[delucchi-cmu]

Closes #820

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[github-actions]

Before [c5f85ab]	After [05463e3]	Ratio	Benchmark (Parameter)
6.46±0.03s	6.53±0.04s	1.01	benchmarks.time_create_large_catalog
964±20ms	975±9ms	1.01	benchmarks.time_create_midsize_catalog
88.2±1ms	89.0±1ms	1.01	benchmarks.time_kdtree_crossmatch
14.7±0.4ms	14.5±0.5ms	0.99	benchmarks.time_box_filter_on_partition
30.5±0.5ms	29.2±0.7ms	0.96	benchmarks.time_polygon_search

Click here to view all benchmarks.

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.46%. Comparing base (c5f85ab) to head (441769a).
⚠️ Report is 188 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lsdb/io/to_hats.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
- Coverage   97.49%   97.46%   -0.04%     
==========================================
  Files          54       54              
  Lines        2475     2484       +9     
==========================================
+ Hits         2413     2421       +8     
- Misses         62       63       +1     

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[camposandro]

Looks good!