Support `debug` and `debug-each` on spread.yaml
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### What needs to get done
The current [models](https://github.com/canonical/craft-application/blob/main/craft_application/models/spread.py) silently discard the `debug` and `debug-each` statements on the top-level and for individual suites.
### Why it needs to get done
Those keys are handy for adding debugging into when tests fail, but as it is currently they need to be declared at the individual task level.
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