feat: add predicate leaf functions

[lxy-9602]

Purpose

No Linked issue.

Introduce concrete LeafFunction and CompoundFunction implementations for all predicate operators:

• Comparison operators: Equal, NotEqual, GreaterThan, GreaterOrEqual, LessThan, LessOrEqual
• Set operators: In, NotIn
• Null operators: IsNull, IsNotNull
• Compound operators: And, Or
• String-pattern operators: Like, Contains, StartsWith, EndsWith

Each operator provides Test() overloads for per-row evaluation, batch (Arrow array) evaluation, and min/max stats-based file skipping.

Tests

API and Format

Documentation

Generative AI tooling

Migrate-by: Aone Copilot (Claude)

[lxy-9602]

Thanks @SteNicholas for contributing the string-pattern predicate operators (Like, Contains, StartsWith, EndsWith) — originally from alibaba/paimon-cpp#130. Migrated as part of this batch. 🎉

[leaves12138]

Reviewed the updated predicate leaf function implementations. The LIKE matcher fix looks good, and the comparison, null, IN/NOT_IN, compound, and string predicate semantics match the Java behavior I checked. Given that tests and public construction entry points will be submitted in the follow-up PR to keep this one focused, I do not see blockers for this PR.

[leaves12138]

Reviewed the latest head. The follow-up LIKE error formatting/emplace cleanup looks good, and I did not find new blockers.