Return raw discovery result in cli discover raw (#1342)

Add `on_discovered_raw` callback to Discover and adds a cli command `discover raw` which returns the raw json before serializing to a `DiscoveryResult` and attempting to create a device class.

kasa/json.py

@@ -8,18 +8,24 @@ from typing import Any
 try:
     import orjson
 
-    def dumps(obj: Any, *, default: Callable | None = None) -> str:
+    def dumps(
+        obj: Any, *, default: Callable | None = None, indent: bool = False
+    ) -> str:
         """Dump JSON."""
-        return orjson.dumps(obj).decode()
+        return orjson.dumps(
+            obj, option=orjson.OPT_INDENT_2 if indent else None
+        ).decode()
 
     loads = orjson.loads
 except ImportError:
     import json
 
-    def dumps(obj: Any, *, default: Callable | None = None) -> str:
+    def dumps(
+        obj: Any, *, default: Callable | None = None, indent: bool = False
+    ) -> str:
         """Dump JSON."""
         # Separators specified for consistency with orjson
-        return json.dumps(obj, separators=(",", ":"))
+        return json.dumps(obj, separators=(",", ":"), indent=2 if indent else None)
 
     loads = json.loads