Add S3 support for attachment uploads

[haiquang9994]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[meltyshev]

Hi! Thanks for the PR 🙏
I’ll try to check everything today/tomorrow and accept it.

[meltyshev]

I've tested everything, and it works fine, but we’d like to make a few changes before releasing this:

• Upgrade to a new version of the SDK, as the current one will no longer be supported in 2025.
• Establish an S3 connection in the startup hook to enable connection reuse (probably should improve performance).
• Avoid storing the full address in the attachment table and construct the address dynamically. If the S3 environment variables are specified, always default to using S3, rather than relying on the type field of an attachment.
• Ensure attachments aren't publicly accessible and always re-stream them through the Planka server (should have a valid accessToken and permissions to see the attachment).

We're accepting it in the current state, and I'll fix the mentioned points in the next commits. Thank you!