A command-line tool/script for making submissions

[snukky]

Is your feature request related to a problem? Please describe.
We would like to have a tool/script for making a new submission from the command line to a specific OCELoT instance.

Describe the solution you'd like

• A Python script that can be used to make a submission in the same way as it is done via https://ocelot.mteval.org/submit
• The script could simply make a JSON request to some API exposed by OCELoT
• The script should not be a Django management command so that it could be installable via setup.py
• If the submission is successful, a message with BLEU and Chrf scores is displayed, otherwise there is an error message

Usage examples (it's only a draft and the script options/usage need a proper design):

# List available test sets from open competitions
./ocelot_submission.py https://ocelot.mteval.org

# Make a submission
./ocelot_submission.py https://ocelot.mteval.org --user team-name --token abcd1234
    --submission submission.xml --format xml --test-set 'newstest2020.en-de'