Add token rotation feature support

[seratch]

To support a new feature that enables apps to rotate OAuth tokens using a refresh token, we can enhance the OAuth flow by:

• Add grant_type and refresh_token to oauth_v2_access API method arguments
• Update the built-in installation store to save refresh_token, expires_in
• Add oauth.v2.exchange API endpoint support
• Add the following properties in AuthorizeResult
  • bot refresh token
  • bot token expires at
  • user refresh token
  • user token expires at
• Update bolt-python's authorize middleware Add token rotation feature support bolt-python#400

To learn more details about the implementation, refer to the Node SDK issue and code:

• Add Support for Token Rotation node-slack-sdk#1241
• Add Support for Token Rotation node-slack-sdk#1244

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

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.models (UI component builders)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.scim (SCIM API client)
• slack_sdk.rtm (RTM client)
• slack_sdk.signature (Request Signature Verifier)

Requirements

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