* refactor: Group redundant ModelKey entries
* Add python script to find and replace hardcoded ModelKey values
* Edited Python script to not automatically use ModelKey for files not
already using it
* refactor: Ran script and accepted obvious changes
* rename 'duration' model key
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Co-authored-by: ggurdin <ggurdin@gmail.com>
* build: reorganize activity-related files
* chore: add roles to instances of activity plan models
* chore: add avatar url to role object
* chore: in activity sessions, replace room creation state event with larger image
* refactor(language levels): Removed Language Levels class converted it to it's own enum file
* refactor(lanugage levels): cleaned up code by removing unused varible and setting initial values to class instances
* refactor(language level): Fixed some loose ends to explicitly take a LanguageLevelTypeEnum
* refactor(language level): implemented changes after testing.
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Co-authored-by: ggurdin <ggurdin@gmail.com>