Add paths method for getting multiple paths

[smcguire-cmu]

Looping through pixel_catalog_file can be inefficient, so add pixel_catalog_files method which generates multiple paths.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.74%. Comparing base (10e527d) to head (238c074). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #258 +/- ## ========================================== + Coverage 95.72% 95.74% +0.01% ========================================== Files 56 56 Lines 1873 1880 +7 ========================================== + Hits 1793 1800 +7 Misses 80 80 ```

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[github-actions[bot]]

Before [af5806af]	After [7e64f04a]	Ratio	Benchmark (Parameter)
failed	20.3±0.5ms	n/a	benchmarks.MetadataSuite.time_load_partition_info_order6
failed	77.2±0.5ms	n/a	benchmarks.MetadataSuite.time_load_partition_info_order7
failed	77.2±0.3ms	n/a	benchmarks.MetadataSuite.time_load_partition_join_info
failed	86.6±3ms	n/a	benchmarks.Suite.time_paths_creation
failed	46.9±0.6ms	n/a	benchmarks.Suite.time_pixel_tree_creation
failed	124±0.2ms	n/a	benchmarks.time_test_alignment_even_sky
failed	13.7±0.1ms	n/a	benchmarks.time_test_cone_filter_multiple_order

Click here to view all benchmarks.