Timeshift score submission should support replay uploads

[smoogipoo]

The request is currently raw JSON data. Maybe a separate request or encoded as b64?

[nanaya]

I don't think it's currently limited to json data.

[peppy]

This requires infrastructure consideration as well.

• Will need a new storage bucket
• Will need expiration considerations (how long should replays be available)
• Will need to assess how many top scores we want to store replays for
• Will need deletion logic for previous (replaced) scores

May be something that should be done outside of the osu-web system (as a queue processor), so we'd want to discuss and sort these points out first.

Also I'd advocate a secondary request or encoded data (we should not be using multipart form in an API ever).