External Json interface to define constraints

**Is your feature request related to a problem? Please describe.**
The library provides excellent capabilty to run data quality rules at scale
However it would be great if the caller could define all the constraints in an external json to decouple the actual rules from the code

**Describe the solution you'd like**
Provide an interface to provide a json of multiple constraints that could be applied to datasets

**Describe alternatives you've considered**
At this stage tge proposed feature is still high level

**Additional context**
Providing a further abstraction of maintaining the dq rules will enable a more wider audience to create them and increase usage