Match Snowflake Boolean-first CSV inference

[osipovartem]

Summary

Snowflake's CSV INFER_SCHEMA keeps BOOLEAN when a boolean row precedes literal 0 or 1, but infers TEXT in the reverse order or when the later value is 2, -1, or 1.0. Preserve this distinction in the opt-in ordered inference state, including chunk merges. Default CSV inference and scan code are unchanged.

Validation

• Targeted Snowflake 10.36.101 probe covered ten boolean/number pairs in both orders. Temporary stage and file format were dropped, and the warehouse was suspended.
• cargo +1.95.0 test --offline -p arrow-csv --lib: 100/100 pass.
• cargo +1.95.0 clippy --offline -p arrow-csv --lib --quiet and cargo +1.95.0 fmt --check --all: pass with unrelated existing Clippy warnings.
• Independent read-only review: approved, no blocking findings.

The opt-in inferred type is consumed by Rustice INFER_SCHEMA metadata. Arrow's ordinary Boolean CSV reader does not currently parse numeric 0/1 as booleans; this PR does not claim to change CSV loading behavior.