Add healpix_to_hipscat_id conversion

[smcguire-cmu]

Change Description

Adds the healpix_to_hipscat_id function to get a hipscat_id for a specified HEALPix pixel. This is useful for operations like efficiently filtering rows within a given file.

Solution Description

Converts the given pixel to order 19, and performs the same calculation to generate the hipscat_id as when computing a hipscat id from ra/dec. This computation has been refactored to be used by both methods.

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

New Feature Checklist

• I have added or updated the docstrings associated with my feature using the NumPy docstring format
• I have updated the tutorial to highlight my new feature (if appropriate)
• I have added unit/End-to-End (E2E) test cases to cover my new feature
• My change includes a breaking change
  • My change includes backwards compatibility and deprecation warnings (if possible)

[codecov]

Codecov Report

Merging #118 (33bb93b) into main (c2ec85c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           45        45           
  Lines         1322      1332   +10     
=========================================
+ Hits          1322      1332   +10     

Files Changed	Coverage Δ
src/hipscat/pixel_tree/pixel_alignment.py	100.00% <ø> (ø)
src/hipscat/pixel_math/hipscat_id.py	100.00% <100.00%> (ø)

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