Added cocktail shaker sort

[Arvind-raj06]

References to other Issues or PRs or Relevant literature

Closes #198.

Brief description of what is fixed or changed

Implementation of the Cocktail Shaker sort in this pull request in reference to the site https://www.sanfoundry.com/python-program-implement-cocktail-shaker-sort/

Other comments

I hope the description is quite useful and if you find any issue with this ping me.....

[codecov]

Codecov Report

Merging #312 (7a4581c) into master (42832f7) will increase coverage by 0.007%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##            master      #312       +/-   ##
=============================================
+ Coverage   98.866%   98.873%   +0.007%     
=============================================
  Files           25        25               
  Lines         2999      3019       +20     
=============================================
+ Hits          2965      2985       +20     
  Misses          34        34               

Impacted Files	Coverage Δ
pydatastructs/linear_data_structures/__init__.py	100.000% <ø> (ø)
pydatastructs/linear_data_structures/algorithms.py	99.502% <100.000%> (+0.054%)	⬆️

[czgdp1807]

Please add tests. See linear_data_structures/tests/test_algorithms.py for pattern of testing followed for sorting algorithms.

[Arvind-raj06]

Yeah process done

[Arvind-raj06]

@czgdp1807 Is there any other improvements needed !?

[czgdp1807]

@Arvind-raj06 Are you contributing through SWOC-2021? Or any other open source program?

[Arvind-raj06]

@Arvind-raj06 Are you contributing through SWOC-2021? Or any other open source program?

Yes through SWOC

[Arvind-raj06]

Before this I didn't knew that there is project on python! I just determined myself to work on this one. There are a few projects on py in SWOC this one really awesome