feat(fonts): improve providers

[florian-lefebvre]

Changes

• Refactors fonts providers
• To keep astro/config as lightweight as possible, splits providers in 2:
  • fonts/providers/index.ts only keeps the config part
  • in fonts/providers/entrypoints keep the implementation to be dynamically imported
• Updates how a provider is dynamically imported to make it more easily testable

Testing

Added unit and types tests

Docs

N/A

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