Use URIRef for the workflow-specific KG node and define pyiron namespace

[samwaseda]

One thing that didn't make sense at all in this PR was that the user was asked to provide a namespace which was used for the workflow logic and the variable names. Now I propose to use simple URIRef for all workflow-specific knowledge graph nodes such as my_workflow.my_node.inputs.my_argument, and for all pyiron_workflow-specific objects we use a pyiron_workflow namespace, which for now I called http://pyiron.org/ontology, which should probably be changed later.

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_ontology/uriref

[codacy-production]

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Coverage variation	Diff coverage
✅ -0.07% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bf4e204)	583	537	92.11%
Head commit (ed384bb)	578 (-5)	532 (-5)	92.04% (-0.07%)

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#100)	21	21	100.00%

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