Add support for Python attach feature

[RemcoSmitsDev]

Waiting on response from debugpy team

The code is fine, but the attach feature for python does not work. We are still looking into this, why it's not working.
We reached out to the debugpy team to get this feature inside the debugger branch.

Debug config

debug.json

[
  {
    "label": "Python Attach Port",
    "adapter": "python",
    "request": {
      "attach": { "process_id": 0 }
    },
    "initialize_args": {
      "port": 5678
    }
  },
  {
    "label": "Python Attach PID",
    "adapter": "python",
    "request": {
      "attach": {}
    }
  },
]

Go into virtual env and execute the following command debugpy --listen localhost:5678 --wait-for-client test.py