Update bitonic_sort.cpp

[khushbooshakya]

Updated the bitonic sort code in simplest form

Description of Change

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:

[khushbooshakya]

Implement Bitonic Sort Algorithm in C++

• Added compAndSwap() to compare and swap elements based on sorting direction.
• Added bitonicMerge() to merge bitonic sequences into the correct order.
• Added bitonicSort() to recursively sort and merge the array.
• Main function demonstrates sorting an array in ascending order.

[realstealthninja]

please use the proper comment format in the contribution guidelines

[realstealthninja]

please document functions using the format in the contribution guidelines