Feat/add-uow-repository

[mustafakemalgordesli]

Added Unit of Work and Generic Repository patterns

• IUnitOfWork interface added to manage unit of work pattern and handle commit operations.
• ITransactionUnitOfWork interface introduced to support transactional operations with commit/rollback capabilities.
• IGenericRepository interface implemented to provide generic CRUD operations with asynchronous support.
• PagedData class added to encapsulate paginated results including items, total count, current page, page size, and total pages calculation.