feat: Add integration tests for storages, proxy configuration

[jirimoravcik]

I am open to suggestions for more tests or some more complicated cases.

We should also think if running the/same similar code in unit and integration tests has some value or not.

[drobnikj]

I will test if open works for the dataset name and as you pass ID, we probably didn't test this in unit tests.

[jirimoravcik]

We test it with names in unit tests. https://github.com/apify/apify-sdk-python/blob/master/tests/unit/actor/test_actor_dataset.py#L22-L25

[drobnikj]

Same here, I would test with name and ID param.

[drobnikj]

Same here, I would test with name and ID param.

[fnesveda]

Cool! I had a few comments, plus I agree with Kuba's comments about testing the named storages.

[fnesveda]

We should also check the RequestQueue class functionality a bit, so that we know it works on the platform.

[jirimoravcik]

So:

• Fixed the newlines that were not fixable by make format
• Added secret input to the get input test
• Improved push_data test
• Created tests for named storages.
• Added a test for the request queue (enqueue 100 urls, fetch them and mark them as handled)

I found out some problems with datetimes, specifically TypeError: can't subtract offset-naive and offset-aware datetimes when diffing in RequestQueue... So I patched it in a way that it works both locally and on platform, we should unify it later.