Fix type definitions in exports…

…and generate `.d.cts` files for CommonJS exports.

lib/binding_web/script/generate-dts.js

@@ -1,12 +1,14 @@
 import { createBundle } from 'dts-buddy';
 
-await createBundle({
-  project: 'tsconfig.json',
-  output: 'web-tree-sitter.d.ts',
-  modules: {
-    'web-tree-sitter': 'src/index.ts'
-  },
-  compilerOptions: {
-    stripInternal: true,
-  },
-});
+for (let ext of ['ts', 'cts']) {
+  await createBundle({
+    project: 'tsconfig.json',
+    output: `web-tree-sitter.d.${ext}`,
+    modules: {
+      'web-tree-sitter': 'src/index.ts'
+    },
+    compilerOptions: {
+      stripInternal: true,
+    },
+  });
+}