Add isort to CI

[VakarisZ]

Is your feature request related to a problem? Please describe.
Isort was running on "fix" mode, we need to add the following line to travis.yaml and then fix all issues isort finds.

## Check import order
- python -m isort ./monkey --check-only --settings-file ./ci_scripts/isort.cfg

This is a prerequisite for #974.

• Create/edit a configuration for isort, make sure isort config is compatible with black config. Ensure travis uses the same configuration. (0d) - @shreyamalviya
• Edit travis config so that the build fails if isort finds any issues. (0d)
• Reformat all imports with isort (0.25d) - @mssalvatore
• Run blackbox and unit tests to ensure nothing wonky happened (0d) - @mssalvatore

[mssalvatore]

This might be helpful information: https://black.readthedocs.io/en/stable/compatible_configs.html#isort

[mssalvatore]

$> isort --help
...
  -c, --check-only, --check
                        Checks the file for unsorted / unformatted imports and prints them to the command line without modifying the file. Returns 0 when
                        nothing would change and returns 1 when the file would be reformatted.
...