Added a function and C# extension method for mapping over the failure type #36
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mapFailure
maps a function over the existing error messages in case of failure. In case of success, the message type will be changed and warnings will be discarded.This is handy when we get a Result from another domain and we want to convert it to be compatible with our domain message type.
It is also helpful when we convert a Choice into a Result to match the type of Choice2Of2 with our domain message type.