[TIMOB-27429] Webpack: Integration into the CLI build command

To integrate Webpack support in the CLI we need the following changes to our build: - A new hook that communicates with appcd-plugin-webpack to get webpack build results. - Assets generated by Webpack need to be excluded from our existing JavaScript processing from node-titanium-sdk. - Bootstrap files will be loaded dynamically during runtime. These files need to be loaded through a [dynamic expression in import()](https://webpack.js.org/api/module-methods/#dynamic-expressions-in-import). - (Optional) Provide the raw sources of our common JavaScript sources. Currently we bundle all files and the deprecated @babel/polyfill via rollup to create the ti.main.js. This could be optimized through a seperate webpack entry point which would allow to load seperate polyfills based in our internal usage, and end-user code usage.