Add audit_log and binlog system tables

[suxiaogang223]

Summary

• Add table$audit_log and table$binlog on top of the system table framework.
• Route catalog, scan, and read paths through context-aware SystemTable interfaces.
• Output rowkind, optional _SEQUENCE_NUMBER, and batch-mode binlog singleton-list columns.
• Reuse the primary-key table read path with delete records preserved; non-primary-key tables return a clear unsupported status.
• Remove the legacy SystemTableRead fallback so system tables use the same scan/read context path.

Part of #141.

Scope

• This PR focuses on batch read correctness for audit_log and binlog.
• Streaming before/after pairing and full predicate pushdown are intentionally left for follow-up work.

Validation

• Fedora: cmake --build build-codex-pr2 --target paimon-core-test paimon-read-inte-test -j4
• Fedora: ./build-codex-pr2/release/paimon-core-test --gtest_filter="FileSystemCatalogTest.TestAuditLogAndBinlogSystemTableCatalog:CoreOptionsTest.*"
• Fedora: ./build-codex-pr2/release/paimon-read-inte-test --gtest_filter="SystemTableReadInteTest.*"

[suxiaogang223]

Hi @lxy-9602 , could you please help review this PR when you have time?

This PR adds the next batch of system table support on top of the merged system table framework: table$audit_log and table$binlog. It includes catalog routing/schema exposure, scan/read integration, rowkind output, optional _SEQUENCE_NUMBER, and related tests for catalog and read paths.

The next PR will continue this work by adding the remaining metadata system tables. :)