Implement Priority Round Robin Scheduling Algorithm with Tests

- Added `priority_rr` algorithm to handle scheduling based on priority and round-robin principles.
- Created unit tests for `select()`, `shouldPreempt()`, and `isQuantumExpired()` functions to ensure correct behavior.
- Developed integration tests to validate the scheduling logic under various scenarios, including preemption and round-robin execution.
- Introduced `useExport` hook for exporting process metrics to CSV format.
- Added `useGanttScroll` hook to manage smooth scrolling of the Gantt chart during simulation.

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