add _sqlite3 module (#11174)

This aligns with the implementation while giving greater fidelity
to runtime naming and inheritance

Related to https://github.com/python/typeshed/issues/3968 and https://github.com/python/typeshed/issues/11141

pyproject.toml

@@ -146,6 +146,7 @@ extra-standard-library = [
     "_random",
     "_sitebuiltins",
     "_socket",
+    "_sqlite3",
     "_ssl",
     "_stat",
     "_thread",