[JingsongLi]

This PR extracts the common Multivalue index foundation from #9282 into a smaller, independently mergeable change.

What changed

• Add ARRAY_CONTAINS to the predicate API, JSON serde, evaluator dispatch, and format visitor fallbacks.
• Add SortedGlobalIndexer and GlobalIndexKeyExtractor so sorted indexes can expose normalized keys instead of requiring builders to sort raw values.
• Add a bitmap-backed Multivalue reader, streaming writer, indexer, options, factory, and manifest metadata.
• Preserve membership-only semantics: unsupported array predicates conservatively fall back to normal scanning.
• Keep the shared bitmap v1 data-file format unchanged.

Split boundary

This foundation PR intentionally does not register the Multivalue SPI or expose table configuration yet. Primary-key, Data Evolution, Flink, and Spark integration remain in #9282 and will register the factory only after their sorted build paths consume normalized element keys.

Validation

• 152 focused tests passed across paimon-common and paimon-format.
• MultiValueBitmapIndexReaderTest passed after removing premature SPI registration.
• Non-fast Maven validate passed for paimon-common and paimon-format, including Checkstyle, Spotless, and Enforcer.
• Independent dependency and compatibility review passed with no remaining P0-P2 findings.

[leaves12138]

Reviewed predicate semantics, JSON/Java serialization compatibility, conservative visitor fallbacks, sorted-key extraction, bitmap metadata and format compatibility, and the focused test suite (152 tests passed). Looks good to me.