SignalR: Add streaming & zero-copy binary protocol
- Introduce OnReceiveStreamMessage for server/client streaming via IAsyncEnumerable<byte[]>
- AcBinaryHubProtocol: switch argument framing to INT32, enable direct zero-copy serialization to SignalR pipe
- Optimize byte[] argument handling (fast-path, no extra alloc)
- BufferWriterBinaryOutput: support configurable chunk size, add FlushAndReset
- AcBinarySerializer: IBufferWriter overload returns bytes written
- Update docs for streaming, protocol, and performance guidance
- Minor refactoring, add InternalsVisibleTo, improve comments
Loretta
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