Add "Expected Loss" implementation to Bayesian solution

[victoralfaro-dotcms]

We should end up looking at “expected loss” as a value to say whether the results are significant enough to say B beats A or A beats B.

Useful links:

• https://towardsdatascience.com/what-comics-can-teach-us-a-b-experiment-analysis-c1ba70e50d0c
• https://www.chrisstucchio.com/blog/2014/bayesian_ab_decision_rule.html

[victoralfaro-dotcms]

Hey team! Please add your planning poker estimate with Zenhub @dsilvam @freddyucv @oidacra

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