[NRBF] Fixes and fuzzing improvements - #110194
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…bstract array types Jagged arrays in the payload can contain cycles. In that scenario, no value is correct for `ArrayRecord.FlattenedLength`, and `ArrayRecord.GetArray` does not have enough context to know how to handle the cycles. To address these issues, jagged array handling is simplified so that calling code can handle the cycles in the most appropriate way for the application. Single-dimension arrays can be represented in the payload using abstract types such as `IComparable[]` where the concrete element type is not known. When the concrete element type is known, `ArrayRecord.GetArray` could return either `SZArrayRecord<ClassRecord>` or `SZArrayRecord<object>`; without a concrete type, we need to return something that represents the element abstractly. 1. `ArrayRecord.FlattenedLength` is removed from the API 2. `ArrayRecord.GetArray` now returns `ArrayRecord[]` for jagged arrays instead of trying to populate them 3. `ArrayRecord.GetArray` now returns `SZArrayRecord<SerializationRecord>` for single-dimension arrays instead of either `SZArrayRecord<ClassRecord>` or `SZArrayRecord<object>` # Conflicts: # src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/SystemClassWithMembersAndTypesRecord.cs
…NrbfDecoder # Conflicts: # src/libraries/Fuzzing/DotnetFuzzing/Fuzzers/NrbfDecoderFuzzer.cs
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* Simplify array handling to fix issues with jagged and abstract array types Jagged arrays in the payload can contain cycles. In that scenario, no value is correct for `ArrayRecord.FlattenedLength`, and `ArrayRecord.GetArray` does not have enough context to know how to handle the cycles. To address these issues, jagged array handling is simplified so that calling code can handle the cycles in the most appropriate way for the application. Single-dimension arrays can be represented in the payload using abstract types such as `IComparable[]` where the concrete element type is not known. When the concrete element type is known, `ArrayRecord.GetArray` could return either `SZArrayRecord<ClassRecord>` or `SZArrayRecord<object>`; without a concrete type, we need to return something that represents the element abstractly. 1. `ArrayRecord.FlattenedLength` is removed from the API 2. `ArrayRecord.GetArray` now returns `ArrayRecord[]` for jagged arrays instead of trying to populate them 3. `ArrayRecord.GetArray` now returns `SZArrayRecord<SerializationRecord>` for single-dimension arrays instead of either `SZArrayRecord<ClassRecord>` or `SZArrayRecord<object>` * extend the Fuzzer to consume all possible data exposed by the NrbfDecoder
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