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issue: #45881 - Add ExternalSource and ExternalSpec fields to collection schema - Add ExternalField mapping for field schema to map external columns - Implement ValidateExternalCollectionSchema() to enforce restrictions: - No primary key (virtual PK generated automatically) - No dynamic fields, partition keys, clustering keys, or auto ID - No text match or function features - All user fields must have external_field mapping - Return virtual PK schema for external collections in GetPrimaryFieldSchema() - Skip primary key validation for external collections during creation - Add comprehensive unit tests and integration tests - Add design document and user guide --------- Signed-off-by: Wei Liu <wei.liu@zilliz.com> Co-authored-by: sunby <sunbingyi1992@gmail.com>