Remove default command handler incl. stream (& adapter stack)

[mStirner]

Because switched to a bridged/active connection approach, the default handler command handler has no more purpose. Never to mind that if this should work a command payload needs to be defined, which is for most cases without adapter stack not working.

• [ ] remove default command handler
• [ ] remove .stream & InterfaceStream
• [ ] remove adapter stack
• [ ] change command handler function arguments
  • remove "cmd",
  • remove "iface"
  • after this, remove interfaces from shared, see: #440
• [ ] https://github.com/OpenHausIO/backend/issues/492
• [ ] Remove .payload property?