Support row-valued IN subqueries

[osipovartem]

Summary

• lower a row-valued IN (subquery) to an EXISTS predicate with positional component comparisons
• preserve correlated outer references and reject tuple/subquery arity mismatches during SQL planning
• cover projected values, top-level predicates, empty inputs, NULL-containing rows, and diagnostics

Snowflake compatibility

A live Snowflake oracle confirmed the covered behavior:

• exact non-NULL tuple: TRUE
• missing tuple: FALSE
• tuple comparisons containing NULL: FALSE
• empty subquery: FALSE

Snowflake currently rejects the separate row-valued NOT IN (subquery) form as an unsupported subquery, so this PR does not claim that form as an oracle case.

Validation

• cargo +1.97.0 fmt --all -- --check
• cargo +1.97.0 test -p datafusion-sqllogictest --test sqllogictests -- subquery_projection --test-threads 1
• cargo +1.97.0 test -p datafusion-sql (92 unit, 584 integration, 12 doc passed)
• cargo +1.97.0 clippy -p datafusion-sql --all-targets -- -D warnings