Merge changes Ib0b874ea,I6252c675,I0bdf5417,I6fd70f06,I7b044388, ...

* changes:
  Add API to create bond between two devices using existing btif API.
  Add ability to find discoverable devices.
  Add API to topshim adapter facade to toggle discovery state of the current topshim device.
  Add APIs to toggle Adapter discoverability between none, connectable and connectable/discoverable.
  Send event data over a map instead of a string for better data representation.
  Creating a Python wrapper for gRPC service for HF Client.
  Create a Rust gRPC service for HF Client.
  Create a new topshim API for the BTIF hfp client (btif_hf_client).