feat: support PostgreSQL range types across Arrow and Pandas

[santosh-d3vpl3x]

Summary

• add support for PostgreSQL built-in range types: int4range, int8range, numrange, tsrange, tstzrange, daterange
• map ranges to string outputs in Arrow/ArrowStream/Pandas transports
• rewrite postgres queries for range columns to cast to ::text so binary/cursor paths deserialize consistently
• add integration coverage for binary/csv/cursor/simple protocols

What Users Get

• ConnectorX postgres reads now return range columns successfully instead of failing on unsupported range deserialization
• behavior is consistent across Arrow and Pandas destinations

Validation

• cargo build --features src_postgres,dst_arrow -p connectorx
• cargo test --features src_postgres,dst_arrow --test test_postgres test_range_types -- --nocapture
• cargo test --features src_postgres,dst_arrow --test test_postgres test_types_binary_postgres
• cargo test --features src_postgres,dst_arrow --test test_postgres test_types_csv_postgres
• cargo test --lib --features src_postgres,dst_arrow -p connectorx range_rewrite_tests -- --nocapture

[wangxiaoying]

Thank you @santosh-d3vpl3x for the PR! The code looks good, can you also add the corresponding python test to here? We can merge the code after that.