Add Amazon S3 Support

[GJ1909]

This is similar to the other object-based storage requests for things like Backblaze B2 and Cloudflare R2. This is a service that a lot of people use and many other products support it. It would be great if Insync could offer native support for this.

Please advise and provide an ETA.

[mia]

Thank you for posting, @GJ1909! I know I might sound like a broken record but would like to express gratitude on behalf of the Insync team for being such an active member in our community