SLSCMN-21 Normalized Event Types

[mwarman]

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🔧 Change Summary

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• Issue: SLSCMN-21
• Create normalized event types for API Gateway events so that implementers do not need to use APIGatewayProxyEvent in handler functions. Instead, implementers may create custom API Gateway Event types.

📝 Checklist

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• Complete a self-review of changes
• Unit tests have been created or updated
• The code is free of [new] lint errors and warnings

🧪 Steps to Test

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1. No lint messages
2. All tests pass with coverage

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