VOParquet metadata generation

[delucchi-cmu]

Closes #568

Generates VOTable metadata for a catalog, given the existing names and dtypes in the _common_metadata. Additional method to write this metadata back to the _common_metadata file in VOParquet key-value pairs.

[github-actions]

Before [d5fdcaa] <v0.7.0>	After [fe97067]	Ratio	Benchmark (Parameter)
390±2ms	403±5ms	1.04	benchmarks.Suite.time_outer_pixel_alignment
265±4ms	267±2ms	1.01	benchmarks.time_open_large_catalog
125±0.3ms	126±1ms	1.01	benchmarks.time_test_alignment_even_sky
12.5±0.4ms	12.5±0.3ms	1	benchmarks.Suite.time_inner_pixel_alignment
41.0±0.9ms	41.1±1ms	1	benchmarks.Suite.time_pixel_tree_creation
269±0.6ms	269±0.7ms	1	benchmarks.time_small_cone_large_catalog
1.03±0.03ms	1.02±0.04ms	0.99	benchmarks.time_test_cone_filter_multiple_order
42.5±0.2ms	41.8±0.4ms	0.98	benchmarks.time_open_midsize_catalog

Click here to view all benchmarks.

[codecov]

Codecov Report

❌ Patch coverage is 98.82353% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.50%. Comparing base (d5fdcaa) to head (f87125a).
⚠️ Report is 84 commits behind head on main.

Files with missing lines	Patch %	Lines
src/hats/io/parquet_metadata.py	98.78%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
+ Coverage   93.05%   93.50%   +0.44%     
==========================================
  Files          48       48              
  Lines        2145     2216      +71     
==========================================
+ Hits         1996     2072      +76     
+ Misses        149      144       -5     

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