Add streaming bodyStream() overloads to HttpResponseMessage.Builder

[ahmedmuhsin]

Summary

Adds two new streaming overloads to HttpResponseMessage.Builder so HTTP-triggered functions can return response bodies without buffering them in memory.

Companion to the Java worker proxy-streaming PR: Azure/azure-functions-java-worker#877.

New API

public interface HttpResponseMessage {
    interface Builder {
        // existing
        Builder body(Object body);

        // new
        Builder bodyStream(InputStream stream);
        Builder bodyStream(IOConsumer<OutputStream> writer);
    }
}

@FunctionalInterface
public interface IOConsumer<T> {
    void accept(T value) throws IOException;
}

bodyStream(InputStream) is for the common case of forwarding an upstream stream (Blob download, large file, etc.). bodyStream(IOConsumer<OutputStream>) is for callback-driven streaming such as Server-Sent Events.

The buffered body(Object) overload is unchanged.

Versioning

This bumps the library to 1.4.0-SNAPSHOT. The Java worker proxy-streaming PR depends on this snapshot. Release once both PRs are reviewed and merged.

Backward compatibility

Pure addition — no existing signatures change. Functions that never call bodyStream(...) see no behavior change. Old worker versions that don't know about the streaming outcome simply continue to use the buffered body(...) path.