Initial Python tracer based on runtime_tracing (#33)

- We hook to the PY_START, PY_RETURN and LINE events and can record a
simple trace.
- We can run the module as on a script like so:
```py
python -m codetracer_python_recorder script.py
```

Author: tzanko-matev

.gitignore

@@ -5,3 +5,4 @@
 **/target/
 build
 *~
+.idea/