feat: make notification channel headings clickable in notification pr…

[eemaanamir]

INF-1062

Explanation:

A new URL, API View, and Serializer have been added to handle the toggle of an entire channel in a specific app of a specific course.

The implementation for the front end can be found in this PR.

[openedx-webhooks]

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[mphilbrick211]

Hi @eemaanamir! Thanks for this contribution. Please let me know if you have any questions regarding submitting a CLA form. Thank you!

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