text: Title: Add interactivity patterns in SocketModeClient document
  Body: Currently, https://slack.dev/python-slack-sdk/socket-mode/index.html has only Events API example. We add interactivity patterns (e.g., shortcuts, modal submission, button clicks, etc.) in the page.
  
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  @~tjstum Thanks for your prompt reply here!
  
  >I might suggest adding something to the docs of SocketModeRequest (and the example usages) mentioning that the WebhookClient/AsyncWebhookClient can be used to work with the response_url provided in the payload. 
  
  This can be helpful for other developers too! Perhaps, rather than docstrings, updating [this documentation page](https://slack.dev/python-slack-sdk/socket-mode/index.html) to have an interactivity payload pattern with `response_url` usage would be a good way to improve the visibility of functionalities.
  
  >Maybe also exposing the response_url as a property (again, to help promote visibility).
  
  Thanks for the suggestion but we are not planning to have the property. The class represents the whole message structure as-is. No modification and addition are intended. I would recommend transforming `SocketModeRequest` data to your own class with utility methods (like we do in Bolt, which is equivalent to your app framework).
  
  I'm thinking to create a new issue for the document improvement and then close this issue. Is that fine with you? Thanks again for your feedback and inputs here.
  
  _Originally posted by @seratch in https://github.com/slackapi/python-slack-sdk/issues/1075#issuecomment-894284214_