Add support Custom profile fields

[Tozapid]

API: https://api.slack.com/methods/users.profile.set

It will be great if we add support for custom profile fields

[github-actions]

Marking this issue as stale due to inactivity. This helps our maintainers find and focus on the active issues. If this issue receives no comments in the next 30 days it will automatically be closed. Maintainers can also remove the stale label.

If this issue was automatically closed and you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thank you!

[Tozapid]

bump?