Implement 0.6 routing and some cleanup (#2117)

* Implement 0.6 routing and some cleanup

* Additional tests and annotation cleanup

* Resolve sorting

* cleanup test with encoding

sanic/blueprint_group.py

@@ -1,9 +1,13 @@
 from collections.abc import MutableSequence
-from typing import List, Optional, Union
+from typing import TYPE_CHECKING, List, Optional, Union
 
 import sanic
 
 
+if TYPE_CHECKING:
+    from sanic.blueprints import Blueprint
+
+
 class BlueprintGroup(MutableSequence):
     """
     This class provides a mechanism to implement a Blueprint Group
@@ -56,7 +60,12 @@ class BlueprintGroup(MutableSequence):
 
     __slots__ = ("_blueprints", "_url_prefix", "_version", "_strict_slashes")
 
-    def __init__(self, url_prefix=None, version=None, strict_slashes=None):
+    def __init__(
+        self,
+        url_prefix: Optional[str] = None,
+        version: Optional[Union[int, str, float]] = None,
+        strict_slashes: Optional[bool] = None,
+    ):
         """
         Create a new Blueprint Group
 
@@ -65,13 +74,13 @@ class BlueprintGroup(MutableSequence):
             inherited by each of the Blueprint
         :param strict_slashes: URL Strict slash behavior indicator
         """
-        self._blueprints = []
+        self._blueprints: List[Blueprint] = []
         self._url_prefix = url_prefix
         self._version = version
         self._strict_slashes = strict_slashes
 
     @property
-    def url_prefix(self) -> str:
+    def url_prefix(self) -> Optional[Union[int, str, float]]:
         """
         Retrieve the URL prefix being used for the Current Blueprint Group