All grids state persistence samples: routing configuration is missing for live-editing

[ddaribo]

For the following demos, when opened in StackBlitz:

1. Grid state persistence
2. HGrid state persistence
3. TreeGrid state persistence
4. PivotGrid state persistence

Routing and routes are not configured, so the samples don't load correctly.

Possibly a regression after migrating to standalone components, similar to this issue.

Here is a fork of the grid sample with an example routing setup for standalone in app.config.ts.