feat(grpc): add server-side stream validators#2602
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Introduces `ServerSendStreamValidator` and `ServerRecvStreamValidator` to enforce strict gRPC semantics on server streams. These are intended to wrap raw transport streams before passing them to application-level handlers, ensuring that user-provided service logic cannot violate protocol rules. - `ServerSendStreamValidator` ensures proper response sequencing (Headers -> Messages -> Trailers) and prevents invalid state transitions, while fully supporting trailers-only responses. - `ServerRecvStreamValidator` safely manages terminal states, ensuring that any subsequent polls after stream completion consistently return an error to prevent undefined behavior. - Adds comprehensive unit tests to verify state machine correctness and protocol compliance.
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Introduces
ServerSendStreamValidatorandServerRecvStreamValidatorto enforce strict gRPC semantics on server streams. These are intended to wrap raw transport streams before passing them to application-level handlers, ensuring that user-provided service logic cannot violate protocol rules.ServerSendStreamValidatorensures proper response sequencing (Headers -> Messages -> Trailers) and prevents invalid state transitions, while fully supporting trailers-only responses.ServerRecvStreamValidatorsafely manages terminal states, ensuring that any subsequent polls after stream completion consistently return an error to prevent undefined behavior.This is recreation of #2595 to allow using a stacked PR workflow