Store check results and remove mseeds once processed

• store check results
• process channels that do not have a stream for last day
• display results
• remove stationxmls at the end
• remove mseeds once processed
• remove previous results when re-running checks
• use pendulum instead of dateutil ?
• use pendulum period.range("days") method
• remove python-dateutil dependency
• use pendulum.datetime.date to define type hint in Check model ?