Always load index column with no pandas metadata

[smcguire-cmu]

Previously, if there was pandas metadata the index column would be always loaded and set as the DataFrame index, even if the users specified columns that didn't include it. With no pandas metadata, the index column would be ignored and the default pandas index used in the DataFrame.

This updates catalog loading to always load the index column if available, with or without pandas metadata.

Fixes #446

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[github-actions]

Before [aa1780a] <v0.4.0>	After [1c7f041]	Ratio	Benchmark (Parameter)
failed	failed	n/a	benchmarks.time_box_filter_on_partition
failed	failed	n/a	benchmarks.time_create_large_catalog
failed	failed	n/a	benchmarks.time_create_midsize_catalog
29.7±0.8ms	30.3±0.8ms	1.02	benchmarks.time_polygon_search
97.8±3ms	97.4±0.7ms	1.00	benchmarks.time_kdtree_crossmatch

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.75%. Comparing base (aa1780a) to head (a176b91).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #449      +/-   ##
==========================================
+ Coverage   97.62%   97.75%   +0.13%     
==========================================
  Files          44       44              
  Lines        1558     1562       +4     
==========================================
+ Hits         1521     1527       +6     
+ Misses         37       35       -2     

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