Add code for longest bitonic sequence in any language

Add the code for longest bitonic sequence in any language ( C, JavaScript, Java, Go, Python or any other)

A bitonic Sequence is a sequence of numbers which is first strictly increasing then after a point strictly decreasing.

The code should be placed at code/dynamic_programming/longest_bitonic_sequence

Sample C++ code: see

Note: multiple contributors can work on this issue as it has multiple parts (languages)

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