feat: Add quickselect algorithm

[graph-theorist]

Description of Change

The Feature Request for this PR: #2781.

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
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Referenced the median of medians algorithm to select a pivot for quickselect.