feat: remove excess dependencies leaves (#128)

This mr improves implicit dependencies processing by reducing tree leaves by using the following algorithm:

* remove paths which belong to any base package
* remove packages which are (opt)dependencies of one of the package which provides same path. It also tries to handle circular dependencies by excluding them from being "satisfied"
* remove packages which are already satisfied by any children path

tests/ahriman/models/test_dependencies.py

@@ -1,6 +1,13 @@
 from ahriman.models.dependencies import Dependencies
 
 
+def test_post_init() -> None:
+    """
+    must remove empty leaves
+    """
+    assert Dependencies({"path": ["package"], "empty": []}) == Dependencies({"path": ["package"]})
+
+
 def test_from_json_view() -> None:
     """
     must construct and serialize dependencies to json