fix(@angular-devkit/build-angular): set public class fields as properties

Configure Babel to use `setPublicClassFields: true`. As when shipping Angular packages without `"useDefineForClassFields": false` will increase the bundle size of an ng-new app
by ~2Kb when `useDefineForClassFields  is not false. due to the additional `_defineProperty`, which will be added on every class property.

See: https://babeljs.io/docs/babel-plugin-proposal-class-properties

Author: alan-agius4

packages/angular_devkit/build_angular/src/babel/presets/application.ts

@@ -211,6 +211,13 @@ export default function (api: unknown, options: ApplicationPresetOptions) {
         targets: options.supportedBrowsers,
         include: includePlugins,
         exclude: ['transform-typeof-symbol'],
+        assumptions: {
+          // Use `setPublicClassFields: true` to avoid decrease bundle sizes
+          // when targetting ES2022+ with `useDefineForClassFields: true`.
+          // This is because ervery property of the class will otherwise be wrapped in a `_defineProperty`.
+          // This is not needed for TypeScript as TS itself will emit the right decleration of class properties.
+          setPublicClassFields: true,
+        },
       },
     ]);
     needRuntimeTransform = true;