feat: add ability to set user pin codes and fix bug with fetching pin codes

[broglea]

Summary

As part of managing a vacation rental I wanted the ability to programmatically set august lock pin codes. Thanks to the APIs documented here https://github.com/jmaxxz/keymaker/blob/master/postman/august.postman_collection.json I was able to implement this.

First we need to perform an update pin operation and then we need to sync the pins to the lock.

Changes

• Add new api method (set_pin_for_user) which performs both the update and the sync

• Fix a bug in pin.py I was hitting when initially calling get_pins() due to a missing key. To do this we switch from direct dictionary access to using .get()

  py-august/august/pin.py:20, in Pin.__init__(self, data)
       18 self._updated_at = data["updatedAt"]
       19 self._loaded_date = data["loadedDate"]
  ---> 20 self._access_start_time = data["accessStartTime"]
       21 self._access_end_time = data["accessEndTime"]
       22 self._access_times = data["accessTimes"]
  
  KeyError: 'accessStartTime'