Generating SHACL constraints from schemas (and vice versa)

[apirogov]

To further improve the bridge into the semantic world, after completing #59 , it could be interesting to check out

https://github.com/mulesoft-labs/json-ld-schema

https://www.w3.org/2019/wot/json-schema

at least to evaluate it and see how well JSON Schema constraints can be mapped to SHACL / RDF.

If it works well enough, it could be nice to provide SHACL export, e.g. by adding a .shacl() method.

This could turn out to be a challenging or not generally feasible feature, so is more speculative.