This pull request adds CherryPy adapter as built-in support. CherryPy is one of the popular web frameworks and the project has been maintained for a long time.

10K+ download per day: https://pypistats.org/packages/cherrypy

The project has been actively maintained for 15+ years: https://github.com/cherrypy/cherrypy/graphs/contributors

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

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter

Requirements (place an x in each [ ])

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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 run ./scripts/run_tests.sh after making the changes.