NewOpenFGAStore returns the implementation of the store.

TODO @shipperizer this is internal material, worth reusing it across the board OpenFGAStore is an overarching store object to deal with OpenFGA entities, meant as a low level object to perform cross cutting logic only relevant to the application, therefore doesn't deal with user interpolations or returns fancy objects, that is offloaded to the service layer favouring reusability.

Tuple is simply a wrapper around openfga TupleKey reason to have it is to hide underlying library complexity in case we want to swap it.

OpenFGAClientInterface is the interface used to decouple the OpenFGA store implementation.