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issue: #46352 - Add GenerateChannelBalancedPrimaryKeys function supporting Int64 and VarChar PK types with even distribution across channels - Add GenerateBalancedInt64PKs and GenerateBalancedVarCharPKs helper functions using murmur3 and crc32 hash algorithms respectively - Add PrimaryKeyConfig struct to configure PK generation in InsertAndFlush - Update InsertAndFlush to use channel balanced PKs instead of random hash keys for better test coverage - Add comprehensive unit tests including end-to-end validation with typeutil.HashPK2Channels to verify exact channel distribution <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Tests** * Enhanced integration tests with configurable primary-key sequencing across insert batches. * Added utilities to generate channel-balanced primary keys for integer and string types. * Expanded test coverage validating balanced distribution, uniqueness, continuation, and large-scale behavior across multiple channels. <sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub> <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Signed-off-by: wayblink <anyang.wang@zilliz.com> Signed-off-by: Wei Liu <wei.liu@zilliz.com>