Add support for `sh:inversePath` in SHACL coverage graphic

[dylan-sa]

When using onto_tool graphic to generate SHACL coverage diagrams, constraints using sh:inversePath are not highlighted in green to indicate coverage. We could tweak the shacl_query in ontograph.py to something like the following:

prefix sh: <http://www.w3.org/ns/shacl#>

select distinct ?class ?property where {
    {
        ?shape sh:targetClass ?class .

        { ?shape sh:property/sh:path ?property . }
        UNION
        { ?shape (sh:and|sh:or|sh:xone|sh:not|rdf:first|rdf:rest)+/sh:path ?property }

    }
    UNION
    # Additional possibility to handle constraints using sh:inversePath along with an sh:class assertion
    {

        ?shape sh:property/sh:class ?class .
        ?shape sh:property/sh:path/sh:inversePath ?property

    }
}