* Extract classes UserRepository and TaskRepository from PromptRepository
* move close_task() to TaskRepository and get_user_leaderboard to UserRepository()
* Use UserRepository in leaderboards endpoint, add type annotation to leaderboards endpoint
* inital commit, created file for MessageTreeState table
* added initial implementation of MessageTreeState SQl model and added it to__init__
* Ran Alembic revision for migration
* reran precommit on
* removed create_data and deleted flag from model
* ran migration revision to remove unwant class variables date_created and deleted
* removed unused imports
* ran pre-commit
* Updated States definiton to be Enums instead fo Constants
* ran pre-commit formatting
* Fixed Enum class
* ran pre-commit
