external rules loaded as json with UT

[sidharthbolar]

Hi @GeekSheikh Have extended this library's capability to load rules from an external Json object Have added the corresponding UT to validate the various Rule Types

It uses circe-json to parse json and defines the custom decoders for the various rule types initialisation options available to user

It does not support MinMax Rules, however can incorporate that in the next drop Please review and let me know in case of any feedback

[sidharthbolar]

This implements the enhancement request #4

[CLAassistant]

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