feat: add next permutation problem

[jafar75]

A practice to find lexicographically next greater permutation of the given array of integers.

• If there does not exist any greater permutation, then print the lexicographically smallest permutation of the given array.
• The implementation below, finds the next permutation in linear time and constant memory and returns in place.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.39%. Comparing base (833a3e5) to head (93c207e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
+ Coverage   87.36%   87.39%   +0.03%     
==========================================
  Files         200      201       +1     
  Lines        5317     5333      +16     
==========================================
+ Hits         4645     4661      +16     
  Misses        533      533              
  Partials      139      139              

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[jafar75]

sounds odd! one of the tests is failing that haven't changed since years ago