Don't require full catalog to plot pixel list

[delucchi-cmu]

Change Description

Closes #157 and partially addresses #156.

Solution Description

Give an explicit error when attempting to visualize a non-on-disk catalog, since no fits points file will be present. Support showing the pixel map for a list of HealpixPixel, outside of a constructed catalog.

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

Merging #159 (80ca21e) into main (8340e73) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #159   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         1522      1527    +5     
=========================================
+ Hits          1522      1527    +5     

Files	Coverage Δ
src/hipscat/inspection/__init__.py	100.00% <100.00%> (ø)
src/hipscat/inspection/visualize_catalog.py	100.00% <100.00%> (ø)

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[github-actions]

Before	After	Ratio	Method
[8340e73]	[febf68e]
197±6ms	221±10ms	1.12	benchmarks.time_test_alignment_even_sky
149±4ms	159±5ms	1.07	benchmarks.time_test_cone_filter_multiple_order
977±30ms	1.04±0.04s	1.07	benchmarks.Suite.time_pixel_tree_creation

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[drewoldag]

Looks great.