Initial MVP for assistify

Based on Rocket.Chat 0.54, Assistify 0.1 adds the following features:

• Integrated conversational AI:
  • Implicitly triggering enterprise search (DB Search for the first iteration) from the client-side
  • Finding related questions (server-side)
• New room types:
  • Expertise (a channel where experts for a definable topic meet)
  • Request (a channel related to an expertise with a purpose and an end, aka. "resolution")
• API for creation of requests with a defined set of experts joined
  All features are implemented for illustration purposes but are not production ready yet (i. e. there is no real authorization concept active yet)