Initial public release: DWG/DXF 2D viewer sample

Standalone Vite sample composing acadrust-dwg WASM, dxf-parser, and Viewer2D.

src/viewer2d/dxfHatchHandler.d.ts

@@ -0,0 +1,5 @@
+/** HATCH entity handler for dxf-parser's registerEntityHandler(). */
+export default class HatchHandler {
+  ForEntityName: string;
+  parseEntity(scanner: unknown, curr: { code: number; value: unknown }): unknown;
+}