Add `download_url`/`downloadUrl` method to sandbox

[ValentaTomas]

If you want to download a file from sandbox you need to use the SDK right now. The download URL method we are adding lets you get the link to a file in sandbox that you can then use to download the file, for example on the frontend, with a direct link.

Tasks

• [x] Test the changes (JS+TS SDKs)
• [x] Update Core SDK in Code Interpreter so this functionality is enabled there too

[changeset-bot[bot]]

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Latest commit: 1f6e308b64e4fd96cca0b86215588f56494d06ce

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