[Enhancement] Migrate to aws-sdk-go-v2

[vigneshsankariyer1234567890]

ffmpeg-go currently uses the 'aws-sdk-go' library, which is fairly heavy. However, a newer and stable version for the SDK has been released, which will allow developers to only use modules which are needed. In our case, we can remove the dependency on the entire AWS module and take only parts which are needed, which includes the S3 module, and session management. This will reduce the bloat of the bindings, something users have been requesting for.

I will open a corresponding PR for this issue, once approval has been given by the lead devs!

[vigneshsankariyer1234567890]

@u2takey Please let me know if this is alright to proceed with!