Make a way to test pymgclient on Mac/OSX

[gitbuda]

The biggest issue here is that pymgclient can essentially only be developed on Linux boxes. It shouldn't be too hard to change that, but there is always but. There is a bunch of similar logic to start Memgraph from Python in many different places: memgraph (e2e test), pymgclient, gqlalchemy (often repeated but slightly different for no reason).

The best solution would be to create a new library called, e.g., pymgutil and place the code there to start Memgraph with different options (native service, native binary, docker, etc.). NOTE: Don't try too hard and put the client logic there because then the circular deps come into place and that's not pretty.