fix(xorq): preserve LargeString when reading parquet

[mesejo]

closes #1041

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
python/xorq/backends/let/datafusion/__init__.py	66.66%	3 Missing ⚠️

Files with missing lines	Coverage Δ
python/xorq/vendor/ibis/formats/pyarrow.py	51.44% <ø> (-1.16%)	⬇️
python/xorq/backends/let/datafusion/__init__.py	62.06% <66.66%> (-9.83%)	⬇️

... and 232 files with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #1198 will not alter performance

_{Comparing fix/read_parquet_preserve_large_string (437593e) with main (9428cc8)}

Summary

✅ 3 untouched benchmarks