Add skolemize

[fils]

Need a function to:

JSON-LD -> n-triples (quads)

n-triples (quads) ------> skolimized blank nodes --------> n-triples (quads)

via https://gleaner.io/id/genid/HASHVALUEHERE

The goal being a function that rolls up a bucket prefix into a single RDF graph for bulk loading into things like Jena via the "Data" HTTP endpoints.

options include:

• https://hashids.org/go/ (convert string to array of ints) which is fine, that is just
  input := []byte("<http://example.org/cars/for-sale#tesla> <http://purl.org/goodrelations/v1#includes> _:b1 ")
• https://github.com/jkomyno/nanoid
• base64 To long with a triple set ref: https://play.golang.com/p/nzPZt_qAmFO

Though a bit of tech debt, the nanoid is documented and at least in terms of round tripping is issue really.

ref: https://www.w3.org/TR/rdf11-concepts/#section-skolemization

[valentinedwv]

Done?