core-text: Add has_table method wrapping CTFontHasTable #739
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This provides a direct and efficient way to check for the existence of a font table, avoiding the overhead of CTFontCopyTable, which unnecessarily allocates a CFData object. This allows callers to perform frequent existence checks more performantly.
This implementation also alligns with other crates like
objc2-core-text.Blocks Servo Issue : servo/servo#38699