Fix/font alignment

[andrewsavage1]

No description provided.

[github-actions]

🤖 Gemini Suggested Commit Message

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starboard: Fix font alignment and caching

Implement mapping for generic font families to ensure correct visual
intent on platforms with limited system fonts. This prevents layout
crashes and ensures fallbacks maintain the desired style.

Introduce a thread-local cache for fallback font platform data to
reduce redundant object creation and improve performance. This includes
memory pressure listeners to purge caches under resource constraints.
Additionally, fix a memory leak in the font configuration parser where
allocated family info was not properly deleted.

Bug: 10763

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