Enable anonymous S3 access by default

[camposandro]

Support anonymous S3 connections without requiring the user to provide a UPath(..., anon=True). This change includes a test for read_hats which verifies that we only initialize the UPath once. Closes #462.

• My PR includes a link to the issue that I am addressing

[github-actions]

Before [435ef8d] <v0.4.7>	After [9e0248a]	Ratio	Benchmark (Parameter)
72.3±0.3ms	73.5±0.4ms	1.02	benchmarks.MetadataSuite.time_load_partition_info_order7
105±1ms	106±0.5ms	1.02	benchmarks.time_test_alignment_even_sky
72.3±0.2ms	72.9±0.3ms	1.01	benchmarks.MetadataSuite.time_load_partition_join_info
1.03±0.01ms	1.04±0.03ms	1.01	benchmarks.time_test_cone_filter_multiple_order
12.4±0.4ms	12.4±0.3ms	1	benchmarks.Suite.time_inner_pixel_alignment
353±2ms	351±2ms	0.99	benchmarks.Suite.time_outer_pixel_alignment
18.9±0.06ms	18.6±0.1ms	0.98	benchmarks.MetadataSuite.time_load_partition_info_order6
39.9±0.7ms	39.0±0.5ms	0.98	benchmarks.Suite.time_pixel_tree_creation

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.21%. Comparing base (757426f) to head (24852e0).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
+ Coverage   93.19%   93.21%   +0.01%     
==========================================
  Files          47       47              
  Lines        2028     2033       +5     
==========================================
+ Hits         1890     1895       +5     
  Misses        138      138              

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