[ARGG-777]: Initial fixes to make it at least compile

[xalechez]

Changes to make react-scripts start-ssr work

• Added .cjs to supported file extensions (otherwise they were put to "media" and not bundled)
• Removed fallbacks to node features for client-side config to not inflate bundle size (we must discourage consumers to use node features in browser)
• Changed entry point for SSR build
• Aligned backpack-addons to Webpack 5 schema
• Removed typescript formatter import as it was removed from original library
• Added debug mode for verbose output both for Webpack and Webpack dev server
• Replaced hash with contenthash as per Webpack 5 recommendations
• Fixed errors in console after run in a test application