add Data Reliability Score - STATA implementation

[AlexGherardelli]

Adding the Data Reliability Score (first implementation in Stata, as created by Alirah) for comments and review

[ValerioGiuffrida]

@AlexGherardelli converted to draft given the code is far from mature.

[AlexGherardelli]

Adding for reference

This implementation is not ready for production because:

• it relies on computed indicators (not present in the script - the prerequisite would be to have a package that compute indicator for any household survey, which we do not have yet)
• does not generalize checks (i.e. relies on specific livelihood coping strategies present in the dataset)
• is it not efficient (i.e. checks 10000 variables to see if 9999 is present)
• it cannot be called from an another piece of code (i.e. cannot be automated)
• does not have validations and does not handle errors (i.e. the code will crash if the input data is not what it expects)