Rules and validation shapes for Blueprint metadata

[tpluscode]

• [ ] 1. Create validation shapes with rules that the Blueprint classes must or should follow
• [ ] 2. Run validation somewhere during the app lifetime

ad. 1

Let's reflect on what constitutes valid instances of BP classes.

1. bp:ClassMetadataShape
   1. Must be a NamedNode (sh:Warning?)
2. bp:Link - TBD
3. bp:Detail - TBD

ad. 2

When metadata is loaded, run validation and display potential validation issues somewhere in a new ⚠️ Warnings section.

We might also offer the means to validate before the app even start - TBD