When importing `debugpy`, `PYDEVD_IPYTHON_COMPATIBLE_DEBUGGING=1` should be set

A new flag is available in `pydevd` which allows a user to step into library code without getting inside of IPython internals while doing so.

To make use of this, `PYDEVD_IPYTHON_COMPATIBLE_DEBUGGING` must be set to `1` in the `os.environ` prior to importing `debugpy`.

See: https://github.com/microsoft/debugpy/issues/869 for more information.