Add a Dataset Profile example (CO2 dataset)

[bact]

Inspired from https://github.com/owid/co2-data/

Structurally and semantically validated against all tools here: https://github.com/spdx/spdx-3-model/blob/main/serialization/json_ld/validation.md

TODOs:

• [x] Valid JSON-LD
• [x] Parseable/make sense on https://json-ld.org/playground/
• [x] Pass validation/generation of spdx3ToGraph
• [x] Pass pyshacl
• [x] Pass check-jsonschema
• [x] Pass ajv