[core] Support Paimon full-text query DSL

[JingsongLi]

Summary

Add compatibility for Paimon's structured full-text query JSON so Java and Python callers can delegate DSL parsing to paimon-full-text.

Changes

• Accept Paimon match, phrase, and boolean JSON aliases, including query, phrase, must, should, and must_not forms.
• Support case-insensitive boolean occur and match operator values in query JSON.
• Carry match-query option fields with defaults and explicitly reject unsupported non-default fuzzy or prefix expansion options.
• Allow logical Paimon column names while querying the physical text field stored in index metadata.
• Add round-trip and search coverage for aliases, boolean forms, and logical column names.

Testing

• cargo test -p paimon-ftindex-core
• cargo build --release -p paimon-ftindex-jni -p paimon-ftindex-ffi
• PAIMON_FTINDEX_LIB_PATH=... PYTHONPATH=... python -m pytest python/tests/test_roundtrip.py -q

[leaves12138]

Reviewed the Paimon full-text query DSL compatibility changes. The implementation keeps the existing JSON forms while adding the Paimon aliases for match/phrase/boolean clauses, validates unsupported match options explicitly, and routes logical Paimon column names to the stored physical text field as described in the PR.

Validation passed locally:

• cargo fmt --all -- --check
• cargo test -p paimon-ftindex-core
• cargo build --release -p paimon-ftindex-jni -p paimon-ftindex-ffi
• cargo clippy --workspace --all-targets -- -D warnings
• PAIMON_FTINDEX_LIB_PATH=... PYTHONPATH=... python3 -m pytest python/tests/test_roundtrip.py -q
• cargo test --workspace

No blocking issues found.