Add fast path for blittable variable-length sequence read#162
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- Introduce efficient decoding for blittable variable-length sequences in DatatypeMessage, avoiding boxing and allocations by casting global heap bytes directly to typed arrays. The fast path is used when element types are unmanaged and sizes match; otherwise, fallback to the existing logic. - Add a benchmark (VariableLengthSequenceRead) to measure performance improvements. Benchmark before: ``` BenchmarkDotNet v0.14.0, Windows 11 (10.0.26200.8524) 13th Gen Intel Core i9-13900KS, 1 CPU, 24 logical and 24 physical cores .NET SDK 10.0.300 [Host] : .NET 8.0.27 (8.0.2726.22922), X64 RyuJIT AVX2 DefaultJob : .NET 8.0.27 (8.0.2726.22922), X64 RyuJIT AVX2 ``` | Method | Mean | Error | StdDev | Gen0 | Gen1 | Allocated | |------------------------ |---------:|--------:|--------:|--------:|--------:|----------:| | ReadVariableLengthPeaks | 563.2 μs | 9.85 μs | 9.21 μs | 45.8984 | 18.5547 | 858.59 KB | Benchmark after: ``` BenchmarkDotNet v0.14.0, Windows 11 (10.0.26200.8524) 13th Gen Intel Core i9-13900KS, 1 CPU, 24 logical and 24 physical cores .NET SDK 10.0.300 [Host] : .NET 8.0.27 (8.0.2726.22922), X64 RyuJIT AVX2 DefaultJob : .NET 8.0.27 (8.0.2726.22922), X64 RyuJIT AVX2 ``` | Method | Mean | Error | StdDev | Gen0 | Gen1 | Allocated | |------------------------ |---------:|---------:|---------:|--------:|-------:|----------:| | ReadVariableLengthPeaks | 95.85 μs | 1.885 μs | 1.671 μs | 10.6201 | 4.3945 | 195.91 KB |
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