Better mypy hints

[delucchi-cmu]

Change Description

Downstream packages that use mypy type checking are unhappy with the loss of type hints in the un-wrapped write_parquet_metadata method.

[github-actions]

Before [3234fcf]	After [9a74b4c]	Ratio	Benchmark (Parameter)
87.6±3ms	89.2±2ms	1.02	benchmarks.Suite.time_paths_creation
378±3ms	379±2ms	1	benchmarks.Suite.time_outer_pixel_alignment
969±3μs	973±4μs	1	benchmarks.time_test_cone_filter_multiple_order
78.7±0.5ms	78.1±1ms	0.99	benchmarks.MetadataSuite.time_load_partition_info_order7
78.4±0.8ms	77.6±0.3ms	0.99	benchmarks.MetadataSuite.time_load_partition_join_info
41.6±1ms	41.1±1ms	0.99	benchmarks.Suite.time_pixel_tree_creation
119±0.8ms	118±1ms	0.99	benchmarks.time_test_alignment_even_sky
13.8±0.7ms	13.2±0.2ms	0.96	benchmarks.Suite.time_inner_pixel_alignment
20.8±0.6ms	19.1±0.7ms	0.92	benchmarks.MetadataSuite.time_load_partition_info_order6

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.85%. Comparing base (3234fcf) to head (78e6ee2).
Report is 31 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #316   +/-   ##
=======================================
  Coverage   93.85%   93.85%           
=======================================
  Files          58       58           
  Lines        2049     2049           
=======================================
  Hits         1923     1923           
  Misses        126      126           

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