Add command to get an attachment (#1080)

[signal-cli] / src / main / java / org / asamk / signal / json / JsonAttachmentData.java

package org.asamk.signal.json;

import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.io.InputStream;

public record JsonAttachmentData(
        @JsonSerialize(using=JsonStreamSerializer.class) InputStream data
) {}