Unable to Create a Custom Shortable Provider in Python

[AlexCatarino]

Expected Behavior

Be able to create a custom shortable provider in Python. For example, the algorithm could fetch the data from Dropbox using the Download method or can define shortable based on the previous day volume.

Actual Behavior

It's not possible since there is no wrapper.

Potential Solution

Implements ShortableProviderPythonWrapper.

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [x] I have confirmed that this is not a duplicate issue by searching issues
• [x] I have provided detailed steps to reproduce the issue