Add concrete examples demonstrating how to run offline AWS Lambda functions in bolt-js app

Description

As mentioned at https://github.com/slackapi/bolt-js/issues/1727#issuecomment-1407256287, running async code from a bolt-js app on AWS Lambda is a common need. This project should provide more detailed information on it.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

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• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

Bug Report

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Start with the related discussion in issue 1727 and inspect the existing Bolt for JavaScript documentation and example structure. Add concrete examples showing how to run asynchronous code in an offline AWS Lambda setup, with documentation that explains how to use and verify each example.