streaming must be paired with httpPayload in protocols that use HTTP binding traits

[david-perez]

This model is accepted by Smithy:

$version: "1.0"

namespace com.amazonaws.simple

use aws.protocols#restJson1

@restJson1
@title("SimpleService")
service SimpleService {
    version: "2022-01-01",
    operations: [
        StreamingOperation,
    ],
}

@http(uri: "/streaming", method: "GET")
operation StreamingOperation {
    input: StreamingOperationInput,
    output: StreamingOperationOutput,
}

@input
structure StreamingOperationInput {}

@output
structure StreamingOperationOutput {
    @required
    streamId: String,
    output: StreamingBlob,
}

@streaming
blob StreamingBlob

Smithy should reject this model and enforce the rule "streaming must be paired with httpPayload in protocols that use HTTP binding traits".

This example is featured in the docs, which would need to be updated.