Remove Local, Global Supervision & Notification

[NicolasFussberger]

The Local- and GlobalSupervision clustering is no longer required, as there is now a simple 1:1 mapping. A supervised process has exactly 1 Alive Supervision.

• Remove classes Local and Global
  • Remove the instantiation of these classes from the FlatCfgFactory
  • Remove the associated configuration in the flatbuffer schema file hm_flatcfg.fbs
• Update the configuration mapping script + tests, which was generating Local and Global configuration
  • Ensure the Demo scenario is still working afterwards
• Remove the Notification class, and instead pass a shared_ptr to IRecoveryClient directly to the Alive class
• When Alive moves to EXPIRED state it should invoke the IRecoveryClient