Add Document state modifier class names

[luisangelrod]

Summary

• add no-data, loading, and error modifier classes to the Document wrapper
• derive rendering and wrapper styling from the same state value
• remove state modifier classes after a document loads successfully
• preserve the existing wrapper class and user-provided className

Testing

• yarn workspace react-pdf lint
• yarn workspace react-pdf tsc
• yarn workspace react-pdf format
• yarn workspace react-pdf unit --run src/Document.spec.tsx (46 passed)
• yarn workspace react-pdf unit --run (197 passed)

Fixes #2057