Support CloudFront (Lambda@Edge) as an event source

[simontabor]

This is a Feature Proposal

Description

Example event format: https://docs.aws.amazon.com/lambda/latest/dg/lambda-edge.html

We can parse this and extract correlation IDs automatically. It'll need to be similar to Kinesis/SQS (ie, logger/correlationIds instance assigned to each record)

Similar or dependent issues:

• Support DynamoDB streams as an event source #67
• Support extracting/sending correlation IDs from/to S3 events #39