Add planner

[RGLie]

Description

Add planner in otl app

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1174 lines in your changes are missing coverage. Please review.

Project coverage is 24.98%. Comparing base (42d492b) to head (bbceaee).

Files	Patch %	Lines
lib/providers/planner_model.dart	0.00%	335 Missing ⚠️
lib/widgets/planner_semester.dart	0.00%	225 Missing ⚠️
lib/pages/planner_course_detail_page.dart	0.00%	209 Missing ⚠️
lib/models/planner.dart	0.00%	92 Missing ⚠️
lib/widgets/planner_preview.dart	0.00%	82 Missing ⚠️
lib/widgets/planner_select.dart	0.00%	61 Missing ⚠️
lib/widgets/planner_semester_select_tabs.dart	0.00%	61 Missing ⚠️
lib/models/planner_course.dart	0.00%	43 Missing ⚠️
lib/pages/planner_page.dart	0.00%	25 Missing ⚠️
lib/providers/track_model.dart	0.00%	20 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   31.08%   24.98%   -6.11%     
==========================================
  Files          80       90      +10     
  Lines        4809     5983    +1174     
==========================================
  Hits         1495     1495              
- Misses       3314     4488    +1174     

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