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/device.py

@@ -9,9 +9,16 @@ from datetime import datetime
 from typing import TYPE_CHECKING, Any, Mapping, Sequence
 from warnings import warn
 
-from .credentials import Credentials
+from typing_extensions import TypeAlias
+
+from .credentials import Credentials as _Credentials
 from .device_type import DeviceType
-from .deviceconfig import DeviceConfig
+from .deviceconfig import (
+    DeviceConfig,
+    DeviceConnectionParameters,
+    DeviceEncryptionType,
+    DeviceFamily,
+)
 from .emeterstatus import EmeterStatus
 from .exceptions import KasaException
 from .feature import Feature
@@ -51,6 +58,22 @@ class Device(ABC):
     or :func:`Discover.discover_single()`.
     """
 
+    # All types required to create devices directly via connect are aliased here
+    # to avoid consumers having to do multiple imports.
+
+    #: The type of device
+    Type: TypeAlias = DeviceType
+    #: The credentials for authentication
+    Credentials: TypeAlias = _Credentials
+    #: Configuration for connecting to the device
+    Config: TypeAlias = DeviceConfig
+    #: The family of the device, e.g. SMART.KASASWITCH.
+    Family: TypeAlias = DeviceFamily
+    #: The encryption for the device, e.g. Klap or Aes
+    EncryptionType: TypeAlias = DeviceEncryptionType
+    #: The connection type for the device.
+    ConnectionParameters: TypeAlias = DeviceConnectionParameters
+
     def __init__(
         self,
         host: str,
@@ -166,7 +189,7 @@ class Device(ABC):
         return self.protocol._transport._port
 
     @property
-    def credentials(self) -> Credentials | None:
+    def credentials(self) -> _Credentials | None:
         """The device credentials."""
         return self.protocol._transport._credentials