feat: add first-class text layers

core/index.ts

@@ -22,3 +22,5 @@ export type { LayerMask } from "./layer-mask";
 export { getLayerMask, hasLayerMask } from "./layer-mask-utils";
 export type { LayerGroup } from "./layer-group";
 export type { RasterLayer } from "./raster-layer";
+export type { TextAlignment, TextFontFamily, TextFontStyle, TextFontWeight, TextLayer, TextStyle } from "./text-layer";
+export { builtInTextFonts, isValidTextStyle, measureTextLayer } from "./text-layer";