Improve Pydantic schema for parts
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Issue body
### What needs to get done
Support part properties such as `source-*`, `override-*`, and `build/stage-packages/snaps` directly in the Pydantic schema, instead of through raw dicts.
### Why it needs to get done
Spawned by the following TODO comment:
https://github.com/canonical/craft-parts/blob/a20b49d1b27ecd00ab74eb786d0f2403184adc97/craft_parts/pydantic_schema.py#L101
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