text: Title: Update "AWS Lambda Bolt Python Examples" page to include Lambda URL
  Body: On 6th of April AWS added new feature - Lambda Function URLs: Built-in HTTPS Endpoints for Single-Function Microservices
  It's cheaper, simpler and faster to setup, than API Gateway. If you don`t require the advanced functionality, such as request validation, throttling, custom authorizers, custom domain names, usage plans, or caching. So, my suggestion is to replace "Set up AWS API Gateway" part with steps to set up Lambda URL, or atleast mention it as an alternative.
  
  ### 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**
  * [x] Others
  