Code splitting

[arbrandes]

Description

Find a way to implement Webpack code splitting for frontend-base apps in such a way that:

• The behavior is configurable via site.config, so that it's possible for an operator to decide what is chunked out, or not
• The default behavior is that the chunks a particular app depends on are loaded by the browser only when needed ("lazily")
• There is no download duplication: the total sum of all chunk sizes does not exceed the size of a monolithic chunc