Feature: Attach scalene to a running process

[laundmo]

If at all possible, i would love to be able to attach scalene to a running python process. This would help in profiling issues that only rarely occur in log-running tasks, since it would allow attaching once the issue has been noticed.

I understand if this isnt feasible, scalene is already a amazing tool that helps a lot regardless.

[thearrow]

Would love this feature, too! Similar to the attach functionality in py-spy - primarily useful to profile web apps running in gunicorn / uvicorn / etc. (I suppose this would be related to #35).