Migrate AWS SDK for JavaScript v2 APIs to v3

[trivikr]

Is your feature request related to a problem? Please describe.

AWS SDK for JavaScript v2 will enter maintenance mode on September 8, 2024 and reach end-of-support on September 8, 2025. For more information, check blog post at https://a.co/cUPnyil

The serverless-image-handler makes calls using AWS SDK for JavaScript v2 at many places
https://github.com/search?q=repo%3Aaws-solutions%2Fserverless-image-handler%20aws-sdk&type=code

Describe the feature you'd like

Migrate AWS SDK for JavaScript v2 APIs to v3.

[trivikr]

A migration attempt was made at #549, blocked at updating tests. Feel free to take over.

[simonkrol]

Hi @trivikr, thanks for the contribution, we'll review adding this to a future release.