Add cost to borrow of stocks. Data from IBKR

[guanquann]

Description

Add cost to borrow of stocks. Data from IBKR. (note: this is a repost since I messed up with my previous pull req. earlier)

How has this been tested?

• Please describe the tests that you ran to verify your changes.
• Provide instructions so we can reproduce.
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Checklist:

• Update our Hugo documentation following these guidelines.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added make sure to add it to the corresponding scripts file.

Others

• I have performed a self-review of my own code.
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• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....

[DidierRLopes]

Since you changed the help text on the dps menu you need to run this command:
pytest tests/openbb_terminal/stocks/dark_pool_shorts/test_dps_controller.py --record-mode=rewrite

This will replace the "test" files and add the CTB command that you just added!

[DidierRLopes]

@guanquann seems you just need to run black on this and should be good!

[guanquann]

@DidierRLopes hopefully it will work this time haha!