Replace AWSCore with AWS.jl

[ararslan]

See #28 for context/discussion. This is the same set of changes but from a branch on the repo rather than from a fork.

Fixes #27.

[ararslan]

Either permissions are still weird or I've messed something up.

[mattBrzezinski]

👀 didn't realize this was even a thing... oops #34

[mattBrzezinski]

@ararslan any capacity to finish this off? I can close my PR if anything. I'll update the permissions on the stack so this should run successfully.

I will note, we should probably bump versions for other deps while we're here.

[ararslan]

any capacity to finish this off?

Unfortunately not, happy to close if you'd prefer, or feel free to push directly to this branch if you're interested in picking it up from here

[mattBrzezinski]

any capacity to finish this off?

Unfortunately not, happy to close if you'd prefer, or feel free to push directly to this branch if you're interested in picking it up from here

I'll close this in favour of #35 and cherry pick in any of these changes that I prefer!