Use example values for JSON interfaces in examples

[chrisvanrun]

Part of the pitch:

• https://github.com/DIAGNijmegen/rse-roadmap/issues/338

This PR uses the example values that @ammar257ammar nicely added for JSON CIVs. In theory, this makes every example now viable for direct upload.

It uses the example values:

• For input values for algorithms
• For output values for algorithms
• For fictive algorithm output for local tests of evaluation methods
• For values for value-kind CIVs in prediction.json of evaluation methods

To address formatting of very long example values (e.g. polygons/2D Bounding Boxes) all rendered/copied partial templates are now also covered by black. This has the nice benefit of cleaning up the formatting of the generated examples.

[amickan]

LGTM!