added c++ backend for cocktail sort

[arvinder004]

Fixes #679

Brief description of what is fixed or changed

• Added the cocktail sort implementation in the C++ Backend file quadratic_time_sort.hpp
• Exposed C++ functions to Python
• Updated Python Functions

[czgdp1807]

How are we testing it?

[arvinder004]

sir i have added a test function, it was not accepting the _test_common_sort() so I have added a seperate test function for cocktail shaker sort that will test both python and C++ Backends