Add url, team, user to AuthorizeResult properties

[seratch]

This pull request adds the following three properties to AuthorizeResult as optional ones.

• team: team's name
• url: team's slack.com domain URL
• user: user's name

These new properties are returned in auth.test API. There is no breaking change to existing apps. If they want to consume these properties, they can access them via context.authorize_result.url etc.

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
• Document pages under /docs
• Others

Requirements (place an x in each [ ])

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• 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/install_all_and_run_tests.sh after making the changes.