Use models namespace

prototorch/models/__init__.py

@@ -0,0 +1,8 @@
+from importlib.metadata import version, PackageNotFoundError
+
+VERSION_FALLBACK = "uninstalled_version"
+try:
+    __version__ = version(__name__.replace(".", "-"))
+except PackageNotFoundError:
+    __version__ = VERSION_FALLBACK
+    pass