Create challenge

    Creates a challenge.
    Parameters:
        - name: Challenge name.
        - type: Only "HABITS" type is possible for now.
        - description: Challenge description
        - startDate: Challenge start date
        - endDate: Challenge end date
        - ownerId: The id of the user to set as an owner of this challenge
        - entitlements: RevenueCat entitlements needed to join this challenge. Null means no needed entitlements.
        - chatGroupLink: Challenge chat group link (WhatsApp or telegram link)
        - maxPoints: Defines the max number of points a user can get in one day, which means the max number of
            habits he can link to this challenge.
        - personalHabitChallenge: Used for personal coaching. Set to false for now.
        - finalGoal: Used for other types of challenges (steps ..). Set to null for now.
        - globalChallenge: Whether the challenge is visible for everyone or not. Set to True for now.
        - teamsNames: List of names of the teams to create