Remove typing imports for List, Tuple, Union

[delucchi-cmu]

See also: astronomy-commons/hats#441

A few kinds of typing imports remain, but the most annoying/silly ones have been removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (1c5c44f) to head (ef178be).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
- Coverage   97.34%   97.33%   -0.02%     
==========================================
  Files          43       43              
  Lines        1732     1724       -8     
==========================================
- Hits         1686     1678       -8     
  Misses         46       46              

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[github-actions]

Before [1c5c44f]	After [ac9c8bd]	Ratio	Benchmark (Parameter)
14.3±0.5ms	14.5±0.5ms	1.01	benchmarks.time_box_filter_on_partition
1.88±0.02s	1.88±0.03s	1	benchmarks.time_create_midsize_catalog
12.6±0.05s	12.5±0.1s	0.99	benchmarks.time_create_large_catalog
88.0±2ms	83.4±2ms	0.95	benchmarks.time_kdtree_crossmatch
29.5±2ms	28.0±0.3ms	0.95	benchmarks.time_polygon_search

Click here to view all benchmarks.