evaluate LinkML, including docs and tooling

[elf-pavlik]

https://linkml.io/

It could provide better path of integration with various existing technologies. As well as developer experience could be better compared to working with raw SHACL

Some docs worth highlighting

• https://linkml.io/linkml/howtos/collaborative-development.html
• https://linkml.io/linkml/generators/shacl.html
• https://linkml.io/linkml/howtos/using-jsonld.html
• https://linkml.io/linkml/howtos/implements-instantiates-guide.html
• https://linkml.io/linkml/schemas/uris-and-mappings.html