Release the GIL when dealing with not Python related things

[antaljanosbenjamin]

Without releasing the GIL while doing not Python related things (especially IO) using multiple threads can be inefficient. A possible workaround is using multiple processes, but then sharing data requires pickling/unpickling.

This issue is the result of a discussion on Memgraph's Discord server.

[Kevin-Mc-Callister]

That's a good description, thanks!