Warn if files are too big

[Wxl19980214]

Describe your changes

Added a check for big files and issue warnings

Issue ticket number and link

Closes #58

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have added thorough tests (when necessary).
• [x] I have added the right documentation (when needed). Product update? If yes, write one line about this update.

[Wxl19980214]

Passed local test. But I haven't try it out for real. There's something wrong the tutorial and I cannot run it.

[edublancas]

hey. yeah, people are having issues with the soopervisor tutorial and we haven't fixed them.

but you can test without following the full tutorial, check this out https://soopervisor.readthedocs.io/en/latest/cookbook/kubernetes.html

[Wxl19980214]

Tested, ready for review

[idomic]

@Wxl19980214 one of the tests is failing: test_copy_warn_if_file_too_big

[Wxl19980214]

checking

[Wxl19980214]

It's windows thing. The directory format is dir\file for windows but dir/file for linux and macOs. I will just remove it

[Wxl19980214]

Ready to run workflow

[edublancas]

approved running workflow

[idomic]

LGTM, nice work!