Extend expression planners for Snowflake compatibility

[osipovartem]

Summary

• add backward-compatible schema-aware hooks for aggregate and scalar expression planners
• support qualified wildcard arguments and wildcard options such as alias.* EXCLUDE (...)
• add opt-in Snowflake-compatible decimal literal normalization
• fall back to Float64 when a fractional/scientific literal exceeds the Decimal256 range
• preserve wildcard join keys, INSERT SELECT source schemas, volatile expressions, and zero-column sort rows
• update h2 to 0.4.16 for RUSTSEC-2026-0258

This PR synchronizes the complete DF55 integration stack used by Rustice into the canonical embucket-sync-df55.0.0 branch. It contains the changes previously reviewed in #48 through #55.

Compatibility

The planner hooks and decimal normalization are opt-in, so default DataFusion parsing and expression planning remain unchanged. The remaining changes fix concrete planner/execution correctness cases exercised by Rustice.

With decimal parsing and trailing-zero normalization enabled:

• 10.00 plans as DECIMAL(2, 0)
• 10.10 plans as DECIMAL(3, 1)
• 0.00100 plans as DECIMAL(4, 3)
• 1.2300e2 plans as DECIMAL(3, 0)
• scientific/fractional values outside Decimal256 range fall back to Float64; oversized integer literals remain errors

Validation

• DataFusion SQL planner unit and integration tests for the new hooks
• qualified wildcard and USING join tests
• decimal literal and out-of-range fallback tests
• focused options.slt run after refreshing the three fallback expectations
• cargo fmt --all -- --check
• CI matrix rerun by this update

[Vedin]

ack

[osipovartem]

All required checks are green, including the full Rust and extended-test matrices. The focused decimal division, AVG rounding, trailing-zero normalization, and out-of-range literal tests also pass locally.

@Vedin Could you submit the acknowledgement as an approving GitHub review? Branch protection still reports REVIEW_REQUIRED, so the PR cannot be merged normally yet.