Use mapstructure library to eliminate loss of type information #1009
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These changes remove the json encoding/decoding steps that are performed during the serialization of ini and dotenv files. This roundtrip loses type information during the transformation which causes values to be incorrectly converted to the json marshaller defaults (
intbecomesfloat64,boolbecomesstring, etc, etc). In place of this json encoding the mapstructure library allows for a direct conversion between the Metadata struct and map[string]interface{} needed to leverage thestores.Flattenandstores.Unflattenfunctions.In addition this adds mapstructure tags to the metadata structures to allow backwards compatibility with the json encoding.
Resolves #879 & #857