Set ctx_closes when opening run using voview

[cydanil]

This MR aims to close #374 in which it's shown how the context manager is not set correctly when using voview files.

The changes can be tested with the example shown in the ticket:

from extra_data import RunDirectory

with RunDirectory("/gpfs/exfel/exp/HED/202330/p900338/raw/r0052", "*S00000*") as fd:
    print(fd)

I updated the tests accordingly.

On an unrelated note, I found that psutil is required to run tests, but is not in the test requirements, which I suppose was not noticed because most have the docs requirements.

Thanks,
Cyril

[takluyver]

LGTM, thanks @cydanil !

[cydanil]

Thanks for the review!