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This PR makes some major revisions to our flutter.js bootstrapper. * Modularize flutter.js into multiple files to make it a little simpler to manage from source code. They are still bundled into a single .js file by esbuild. * Added a `types.d.ts` file which contains declarations of the types of some of the objects used in the flutter.js API * Deprecated the old `FlutterLoader.loadEntrypoint` API and added a new function simply called `FlutterLoader.load`, which has a few more capabilities: - A build tool can inject a build config, that may describe multiple builds that `FlutterLoader.load` can attempt to use. It will use the first one that is compatible with the browser environment and the user's configuration. - It can also load wasm flutter apps. - It also pre-loads and instantiates CanvasKit (and Skwasm) as necessary depending on the build configuration. - `FlutterLoader.load` also immediately takes a flutter configuration object. If an `onEntrypointLoaded` callback is not provided by the user, it just does the expected thing and initializes the engine and immediately starts the app, passing the configuration along as needed. * `flutter.js` has the engine hash built into it now, which allows it to ascertain the correct CDN URLs for both CanvasKit and Skwasm.