Scheduling the report. Options are [noRepeat, daily, weekly, monthly],
e.g. when running the report "now" itself => "schedule": {} - then "begin_dt" & "end_dt" are mandatory,
when scheduling the report at "daily" => "schedule": {"freq": "daily", "hour": 12}
when scheduling the report at "weekly" => "schedule": {"freq": "weekly", "day": 0, "hour": 12}
when scheduling the report at "monthly" => "schedule": {"freq": "monthly", "date": 1, "hour": 12}