Android: Update to new Course API

Description

The following ticket summarizes the interface changes between the old and new APIs: https://openedx.atlassian.net/browse/MA-978

Let me know if you have any questions or run into any issues.
mobile-dev has been updated with the latest code.

Steps to Reproduce

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Reason for Variance

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Release Notes

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Assignee

Mian Khalid

Reporter

Nimisha Asthagiri

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Fix versions

Priority

CAT-2
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