Upgrade AWS dependencies and general code cleanup #78
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This has a bunch of changes related to code formatting, but the only files that actually need review are:
The dependency changes are:
com.amazonaws:aws-lambda-java-core:1.2.3(previous version: 1.1.0)com.amazonaws:aws-lambda-java-events:3.15.0(previous version: 2.2.7)software.amazon.awssdk:s3:2.31.43(replaces com.amazonaws:aws-java-sdk-s3:1.12.771)software.amazon.awssdk:s3-event-notifications:2.31.43(replaces com.amazonaws:aws-java-sdk-s3:1.12.771)