preload font files into memory to avoid frequent IO. #366
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iola1999
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close #367 .
I believe this might be related to how the underlying dependencies (resvg/fontdb) handle font loading, rather than an issue with resvg-js itself.
This PR adds a preloadFonts option to load font files into memory at initialization. While this doesn't address the root cause in the underlying libraries, it provides a practical workaround for resvg-js users experiencing performance issues with text-heavy SVGs.