Add pixel tree catalog init input type

[smcguire-cmu]

Change Description

Adds the option to initialize a Catalog with a PixelTree in addition to the PartitionInfo that we currently have.

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 #117 (8fd89a5) into main (2c4a9f1) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #117   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           45        45           
  Lines         1313      1322    +9     
=========================================
+ Hits          1313      1322    +9     

Files Changed	Coverage Δ
src/hipscat/catalog/catalog.py	100.00% <100.00%> (ø)

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