feat: add huddle_state fields to SlackUserProfile

[lfrancke]

The documentation is a bit inconsistent, but the huddle_state seems to have the states in_a_huddle or default_unset

• https://docs.slack.dev/reference/events/user_huddle_changed/
• https://docs.slack.dev/reference/methods/users.profile.get/

[abdolence]

Hi, thanks for the PR.

The documentation is a bit inconsistent

I'm not surprised :)

[abdolence]

Thanks for contributing!