Field extraction for Parquet VARIANT columns (scalar + nested objects)#22416
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Adds the scalar/object-descent slice of cudf::extract_variant_field on top of the variant reader infra in rapidsai#22310. Provides three public APIs in cudf::io::parquet::experimental: * get_variant_field - extract raw VARIANT bytes at an object-key path * cast_variant - decode VARIANT value blobs to STRING or INT8/16/32/64 * extract_variant_field - convenience composition of the two Path grammar is intentionally limited to $?(.name)+ for Phase A; bracket steps and array indexing are reserved for a follow-on phase. The parser rejects bracket/quoted/index/wildcard syntax with std::invalid_argument. Implementation: * Two-pass kernel: sizing pass parses the path per row, memoizes the intra-blob source offset, and writes the per-row null mask; the copy pass is a pure gather using the memoized offsets. * Object-field lookup walks all n+1 field offsets to find the tightest end (Variant fields can be stored out-of-order). * extract_variant_field validates only once and goes through the detail:: overloads to avoid revalidating the well-formed intermediate. Includes 40 GTests covering null handling, multi-row mixed shapes, the Apache parquet-testing object fixtures, dictionary/object scans 10x larger than the unit fixtures, and a 128-row deep-path null-mask race test.
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Description
Depends on #22310
Contributes to #22312
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