Organize course repos (#4262)
* integrate CoursePlansRepo.translateActivity, translateTopic, translateCoursePlan
* move translation functions to requisite files
* integrate translation endpoint
* refactor: reorganize course-related repos, add request and response model classes
* remove l2s from translation requests
* update translation request and response models, use translation endpoint to get course info, cache courses with L1s in cache key
* update topics repo to use translation endpoint
* use activity translation endpoint
* refactor: incremental loading of individual course info, account for discrepancy between translated IDs and original IDs
* incremental loading of course batches
* Update lib/pangea/course_plans/courses/course_plan_room_extension.dart
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
* cleanup
* cleanup
* fix: some name changes
* formatting
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Co-authored-by: WilsonLe <leanhminh2907@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: wcjord <32568597+wcjord@users.noreply.github.com>
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