feat: migrate from rusoto to aws-sdk-rust

[ryota-sakamoto]

Issue #, if available:

close #51

Description of changes:

rusoto is in maintenance mode so we need to migrate from rusoto to aws-sdk-rust.

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[StoneDot]

This task is blocked by #143.

[ryota-sakamoto]

@StoneDot

Thank you for review. I have addressed all of the points you mentioned.