Use @aws-sdk/client-s3, @aws-sdk/s3-request-presigner packages instead of aws-sdk

[mvandoff]

Hello, thanks for the lovely library. I haven't implemented it yet but was surprised to find the entire aws-sdk being pulled in. Surely the s3 packages would be enough no?

[toniopelo]

I guess you're right @mvandoff, this is a good point. Would you be willing to create a PR ? :)

[mvandoff]

Life is hectic right now but I'll look into it.

[mvandoff]

@toniopelo I need to be able to add metadata to the uploads, can I add support for that while I'm at it?

[toniopelo]

@mvandoff Sure thing, you can make a proposal PR, best would be to have these as two separated PRs so one doesn't block the other. This is just in case, as if everything looks good, I'll merge both.
Only recommendation to male things smooth: only add optional parameters on top of the existing API and use strong types.