Adding pod-cpu-hog experiment in litmus-python

[oumkale]

DoD:

• Follow the contribute guide to generate an experiment that is, by default, pod-cpu-hog with the name sample_exec_chaos.

• Use sample guide contribute/developer-guide
  or create-chaos-experiments-using-the-litmuschaos-python-sdk to generate the experiment and test it.

• Replace all occurrences of sample_exec_chaos with pod-cpu-hog and sample_category with generic.

• Test the experiment both locally and using the operator or okteto approach.

• Once tested, raise a PR in the litmus-python repo for pod-cpu-hog.

• [Optional] Contributing Guidelines for the Chaos Hub

Note: The LitmusChaos SDK is a development kit that generates experiment. Follow the guidelines in this blog
to create and test your experiment. Once it is working, replace the default sample experiment name with pod-cpu-hog, as the default generated experiment is pod-cpu-hog.