Add friendly_name to device (#4296)

esphome/core/__init__.py

@@ -453,6 +453,8 @@ class EsphomeCore:
         self.ace = False
         # The name of the node
         self.name: Optional[str] = None
+        # The friendly name of the node
+        self.friendly_name: Optional[str] = None
         # Additional data components can store temporary data in
         # The first key to this dict should always be the integration name
         self.data = {}
@@ -492,6 +494,7 @@ class EsphomeCore:
     def reset(self):
         self.dashboard = False
         self.name = None
+        self.friendly_name = None
         self.data = {}
         self.config_path = None
         self.build_path = None