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

[seratch]

Description

As mentioned at #1727 (comment), 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

Requirements (place an x in each of the [ ])

• 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.

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