Rename ValuesQuerySet -> _ValuesQuerySet and remove _BaseQuerySet. Ma… (#654)

* Rename ValuesQuerySet -> _ValuesQuerySet and remove _BaseQuerySet. Make a public alias called ValuesQuerySet in django_stubs_ext.

* Update tests

django_stubs_ext/django_stubs_ext/__init__.py

@@ -1,3 +1,4 @@
+from .aliases import ValuesQuerySet as ValuesQuerySet
 from .patch import monkeypatch as monkeypatch
 
-__all__ = ["monkeypatch"]
+__all__ = ["monkeypatch", "ValuesQuerySet"]

django_stubs_ext/django_stubs_ext/aliases.py

@@ -0,0 +1,8 @@
+import typing
+
+if typing.TYPE_CHECKING:
+    from django.db.models.query import _T, _Row, _ValuesQuerySet
+
+    ValuesQuerySet = _ValuesQuerySet[_T, _Row]
+else:
+    ValuesQuerySet = typing.Any

django_stubs_ext/tests/typecheck/test_aliases.yml

@@ -0,0 +1,16 @@
+-   case: alias_values_query_set
+    main: |
+        from django_stubs_ext import ValuesQuerySet
+        from myapp.models import Blog
+
+        a: ValuesQuerySet[Blog, Blog]
+    installed_apps:
+        - myapp
+    files:
+        -   path: myapp/__init__.py
+        -   path: myapp/models.py
+            content: |
+                from django.db import models
+
+                class Blog(models.Model):
+                    created_at = models.DateTimeField()