* feat: update lesson to array

* chore: fix lint

* fix: update test cases

* chore: format lint

* chore: update test cases

* feat: update timetable redux schema

* feat: fix lint

* chore: fix lint

* chore: add timetable schema migration test

* fix: add comment for test version

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Co-authored-by: Christopher Goh <chrisgzf@gmail.com>

* feat: fix lint

* feat: add customise module button

* feat: add redux actions

* feat: connect button to redux action

* feat: enter and edit module

* feat: exit customising state

* cahnge customisemod default state to empty string

* feat: add timetable state for custimised mods

* feat: remove validation for custom mods

* feat: add TA label to cells

* feat: hide and disable other edit buttons when editing

* feat: add support for changing lessons after customisation

* chore: fix test cases

* chore: fox lint

* chore: fix schema migration test