Make device initialisation easier by reducing required imports (#936)

Adds username and password arguments to discovery to remove the need to import Credentials.
Creates TypeAliases in Device for connection configuration classes and DeviceType.
Using the API with these changes will only require importing either Discover or Device
depending on whether using Discover.discover() or Device.connect() to 
initialize and interact with the API.

kasa/__init__.py

@@ -20,10 +20,10 @@ from kasa.credentials import Credentials
 from kasa.device import Device
 from kasa.device_type import DeviceType
 from kasa.deviceconfig import (
-    ConnectionType,
     DeviceConfig,
-    DeviceFamilyType,
-    EncryptType,
+    DeviceConnectionParameters,
+    DeviceEncryptionType,
+    DeviceFamily,
 )
 from kasa.discover import Discover
 from kasa.emeterstatus import EmeterStatus
@@ -71,9 +71,9 @@ __all__ = [
     "TimeoutError",
     "Credentials",
     "DeviceConfig",
-    "ConnectionType",
-    "EncryptType",
-    "DeviceFamilyType",
+    "DeviceConnectionParameters",
+    "DeviceEncryptionType",
+    "DeviceFamily",
 ]
 
 from . import iot
@@ -89,11 +89,14 @@ deprecated_smart_devices = {
     "SmartDimmer": iot.IotDimmer,
     "SmartBulbPreset": IotLightPreset,
 }
-deprecated_exceptions = {
+deprecated_classes = {
     "SmartDeviceException": KasaException,
     "UnsupportedDeviceException": UnsupportedDeviceError,
     "AuthenticationException": AuthenticationError,
     "TimeoutException": TimeoutError,
+    "ConnectionType": DeviceConnectionParameters,
+    "EncryptType": DeviceEncryptionType,
+    "DeviceFamilyType": DeviceFamily,
 }
 
 
@@ -112,8 +115,8 @@ def __getattr__(name):
             stacklevel=1,
         )
         return new_class
-    if name in deprecated_exceptions:
-        new_class = deprecated_exceptions[name]
+    if name in deprecated_classes:
+        new_class = deprecated_classes[name]
         msg = f"{name} is deprecated, use {new_class.__name__} instead"
         warn(msg, DeprecationWarning, stacklevel=1)
         return new_class
@@ -133,6 +136,10 @@ if TYPE_CHECKING:
     UnsupportedDeviceException = UnsupportedDeviceError
     AuthenticationException = AuthenticationError
     TimeoutException = TimeoutError
+    ConnectionType = DeviceConnectionParameters
+    EncryptType = DeviceEncryptionType
+    DeviceFamilyType = DeviceFamily
+
     # Instanstiate all classes so the type checkers catch abstract issues
     from . import smart