Have code suggestion log message for unmatched request patterns

[seratch]

Description

As we implemented in Python and Java, we can provide the similar guidance log messages in Bolt for JS.

$ npx node app.js
⚡️ Bolt app is running!

Unhandled request ({"event": {"type": "message"}, "type": "event_callback"})
---
[Suggestion] You can handle this type of event with the following listener function:

app.event("message", async ({ body, logger }) => {
  logger.info(body);
});

• Add missing listener suggestion to the default unhandled error message bolt-python#323
• Fix #719 Enable developers to customize the way to handle unmatched requests java-slack-sdk#741
• Enable developers to customize the way to handle unmatched requests java-slack-sdk#719 (comment)

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.

[TheManWhoStaresAtCode]

As I was debugging my event listener in the app for quite some time and I think this functionality would have helped me a lot I would love to contribute here. However, I'm quite unsure where I need to do the required adjustments - where is this statement
Unhandled request ({"event": {"type": "message"}, "type": "event_callback"}) actually logged?

Apart from this starting point, I checked the python implementation here and would have implemented it very similar also here. Is this what was intended by you?

[seratch]

@TheManWhoStaresAtCode Yes, this issue is for implementing the same (or mostly the same) thing with bolt-python / bolt-java. Checking the test code may be also helpful. https://github.com/slackapi/bolt-python/blob/main/tests/slack_bolt/logger/test_unmatched_suggestions.py