feat: add round robin scheduling algorithm with tests

[Kartikay-0111]

Description of Change

This PR adds the implementation of the Round Robin Scheduling algorithm. It calculates:

• Waiting Time (WT).
• Turnaround Time (TAT).

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added tests and example, test must pass
• [x] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.