[GLUTEN-11708][VL] Enable Bloom filter might_contain to subfield filter translation

[zhztheplayer]

Fixes #11708

[Copilot]

Pull request overview

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Enables optional translation of Spark might_contain (Bloom filter) expressions into Velox subfield filters, controlled by a new static configuration flag.

Changes:

• Added a new static config spark.gluten.sql.columnar.backend.velox.scan.bloomFilterPushdown.enabled (Scala + C++ + docs).
• Extended SparkExprToSubfieldFilterParser to parse might_contain(bloomFilter, xxhash64_with_seed(seed, field)) into a Bloom-filter-backed Filter.
• Wired the new config into Velox backend initialization when registering the parser.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/velox-configuration.md	Documents the new Velox scan Bloom filter pushdown config flag.
cpp/velox/operators/functions/SparkExprToSubfieldFilterParser.h	Adds config-driven enablement for Bloom filter translation.
cpp/velox/operators/functions/SparkExprToSubfieldFilterParser.cc	Implements constant-evaluation + might_contain parsing and a Bloom-filter-backed filter type.
cpp/velox/config/VeloxConfig.h	Introduces C++ config key + default for enabling Bloom filter pushdown.
cpp/velox/compute/VeloxBackend.cc	Passes the config flag into the parser registration.
backends-velox/src/main/scala/org/apache/gluten/config/VeloxConfig.scala	Adds the corresponding static Spark/Gluten config entry and getter.

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