[S3 Datasource] Generate presigned url for upload without data

[qbx2]

To upload large files, the data should not be uploaded through openblocks. Instead, it would be ideal for openblocks to generate presigned urls to frontend and for client to upload files to S3 directly using the presigned url.

[lmx1117]

Thanks for your good suggestion, we will take it into account 🙌, and may I know what brought you to create this issue? Concern about the pressure on our service or worry about data security?

[qbx2]

@lmx1117 It is just for efficiency (latency and bandwidth), not about data security.

[lmx1117]

OK, got that👍, thanks for ansering.