Add Python 3 modules, and more Python 2 modules.

Also, sort names alphabetically and add module docstrings.

python3/_tracemalloc.py

@@ -0,0 +1,24 @@
+"""Stub file for the '_tracemalloc' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more percise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+def _get_object_traceback(*args, **kwargs) -> object: pass
+
+def _get_traces() -> object:
+    raise MemoryError()
+
+def clear_traces() -> NoneType: pass
+
+def get_traceback_limit() -> long: pass
+
+def get_traced_memory() -> tuple: pass
+
+def get_tracemalloc_memory() -> object: pass
+
+def is_tracing() -> bool: pass
+
+def start(*args, **kwargs) -> NoneType:
+    raise ValueError()
+
+def stop() -> NoneType: pass