Need a cube validation tool

[forman]

We need a tool that can validate

• a given cube.geojson against spec and schema;
• a given data cube against spec.

Interfaces are

• Python function;
• CLI.

The tool shall generate a report containing infos, warnings, and errors.

• Infos, if according to specs, something could be improved
• Warnings, if something is missing that is suggested by the spec but not mandatory.
• Errors, if something is missing that is required by the specs (e.g. dimension order), or on schema validation failures.