fix(paimon): improve filter pushdown and preserve remaining filters

[Weixin-Xu]

Preserve untranslated Paimon filters as remaining filters, fold constant RHS expressions before predicate translation, and support string LIKE predicates.

Add translator coverage for remaining filters, constant RHS pushdown, subfield filter round trips, and string LIKE cases.

What problem does this PR solve?

Issue Number: close #685

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 🚀 Performance improvement (optimization)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• 🔨 Refactoring (no logic changes)
• 🔧 Build/CI or Infrastructure changes
• 📝 Documentation only

Description

• Split top-level AND filters into conjuncts and translate each conjunct independently.
• Push translated conjuncts into Paimon as native predicates.
• Preserve untranslated conjuncts as remaining filters and evaluate them after reading batches.
• Build the Paimon read schema with additional columns required by remaining filters.
• Fold constant RHS expressions with ExpressionEvaluator before translating literals.
• Add string LIKE predicate support for two-argument LIKE; keep three-argument LIKE with explicit escape as remaining filter.
• Add translator and connector tests for residual filters, partial pushdown, constant RHS expressions, LIKE predicates, and round-trip subfield filter behavior.

Performance Impact

• No Impact: This change does not affect the critical path (e.g., build system, doc, error handling).

• Positive Impact: I have run benchmarks.

  Click to view Benchmark Results

  Paste your google-benchmark or TPC-H results here.
  Before: 10.5s
  After:   8.2s  (+20%)
  

• Negative Impact: Explained below (e.g., trade-off for correctness).

Release Note

Please describe the changes in this PR

Release Note:

Release Note:
- Improved Paimon filter pushdown by preserving untranslated conjuncts as remaining filters.
- Added constant RHS expression folding and string LIKE predicate support for Paimon filter translation.

Checklist (For Author)

• I have added/updated unit tests (ctest).
• I have verified the code with local build (Release/Debug).
• I have run clang-format / linters.
• (Optional) I have run Sanitizers (ASAN/TSAN) locally for complex C++ changes.
• No need to test or manual test.

Breaking Changes

• No

• Yes (Description: ...)

  Click to view Breaking Changes

  Breaking Changes:
  - Description of the breaking change.
  - Possible solutions or workarounds.
  - Any other relevant information.