feat: [FC-0031] Add DefaultPagination in UserCourseEnrollmentsList

[oksana-slu]

Description

The pagination is necessary for UserCourseEnrollmentsList to optimize course loading in the mobile app.
The pagination for this endpoint was introduced along with a new version (v3) of the mobile API.

Supporting information

This contribution is done as a part of the project FC-0031

Testing instructions

api/mobile endpoints are now available with v3 api version.

GET /api/mobile/v3/users/<user_name>/course_enrollments/, and see the Default Pagination fields, as count, num_pages, current_page, results in the response.

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[feanil]

Couple of comments inline. Generally, I wonder if overloading all the API versions into one class still makes sense or if we should make a new API class that calls the same underlying business logic functions. This way the DRF machinery is better separated from the shared business logic. It will duplicate the comments a bit but given that there are changes between API versions and we're not updating the view docstring, maybe it would make that sort of thing easier to catch.

[feanil]

@GlugovGrGlib I think this is good to go but we should update the docs/comment as suggested above first.

[feanil]

Let me know when that's done and I can coordinate merging it.

[GlugovGrGlib]

Let me know when that's done and I can coordinate merging it.

This will be updated today, thanks!

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2U Release Notice: This PR has been deployed to the edX production environment.