Add Lambda function for the Amazon Security Lake integration

[AlexRuiz7]

Description

This PR adds extends the docker-compose environment for the Amazon Security Lake integration with a new AWS Lambda container, for local testing and development. It also adds a handler to the python module as an entry point for Lambda.

Follow the instructions to get started.

Branch is based on #186.

The Logstash pipeline fetches data every 5 minutes and uploads it to the S3. Events (documents) are stored one per line.

On the other hand, the AWS lambda is ready at http://localhost:9000/2015-03-31/functions/function/invocations.

curl "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"payload":"hello world!"}'
"Hello from run.py: {'payload': 'hello world!'}"

References:

• https://docs.aws.amazon.com/lambda/latest/dg/python-image.html
• https://docs.aws.amazon.com/lambda/latest/dg/images-test.html

Issues Resolved

Closes #146

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
• [ ] Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• [ ] Commits are signed per the DCO using --signoff
• [ ] Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• [ ] Public documentation issue/PR created

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