Support parquet v2 format

[aykut-bozkurt]

Supports reading or writing parquet files with format v2. By default, we write files in v1 format to improve interop with common query engines. But you can specify COPY table TO '..' with (parquet_version 'v2').

Closes #104.

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.90%. Comparing base (cc442d0) to head (96dcef5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pgrx_tests/common.rs	61.53%	5 Missing ⚠️
src/pgrx_tests/copy_type_roundtrip.rs	89.47%	2 Missing ⚠️
...c/parquet_copy_hook/copy_to_split_dest_receiver.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   90.83%   90.90%   +0.07%     
==========================================
  Files          91       92       +1     
  Lines       10382    10420      +38     
==========================================
+ Hits         9430     9472      +42     
+ Misses        952      948       -4     

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