Create logic to sync google calendar to user profile in slack

[Tomasz-Kluczkowski]

• using previously implemented logic
• periodically read events from google calendar (since they may have changed)
  • interval can be set as a configuration or command line parameter
• update status of slack user profile based on mapping of google calendar event title to slack status text/emoji/expiration time
  • use event end time for slack status expiration time
• decide what should the status become when previous expires
  • should there be a default status that is set when previous one expires?
  • should it be set in application config?