Deep require `aws-sdk` deps for a potentially large cold start perf boost

[ryanblock]

Retire aws-sdk-mock (84.8MB) for ~15 lines of code

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[ryanblock]

This is rad. I'm seeing consistent ~150ms requires for all the core services Arc Functions uses. This is a gigantic improvement compared to 400-900ms just loading all of aws-sdk in Lambda.

If we land this PR, this means the coldstart hit of Arc Functions hit will always be within a band of ~30-180ms.