Added Iterative Quick Sort

[sebe324]

Description of Change

I've added an implementation of iterative quick sort.
It uses the stack instead of recursion.

Checklist

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

Notes:

[github-actions]

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[sebe324]

can someone check this pr out? @realstealthninja

[realstealthninja]

Clean documentation. Well written too! Thank you for this contribution ♥️

[realstealthninja]

Tests failing! The issue is the functions youre using inside test is not the namespaced one

Fix is prefixing the function calls with

   sorting::function_name()

[sebe324]

Oh I forgot, I'll fix it later today.

[realstealthninja]

Looks good