Feature put object stream property

[rristov60]

This PR extends the Put Object node by adding additional flag Stream (msg.stream) to allow users to upload files by providing body as a stream. We recommend using the following function to convert string body to stream

// Convert stream to string
const streamToString = (stream) =>
    new Promise((resolve, reject) => {
        const chunks = [];
        stream.on("data", (chunk) => chunks.push(chunk));
        stream.on("error", reject);
        stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")));
    });