build: integrate DLL plugin

[dsebastien]

Goal: see if we can improve build times Refs:

• https://robertknight.github.io/posts/webpack-dll-plugins/
• https://webpack.js.org/plugins/dll-plugin/
• https://github.com/webpack/webpack/tree/master/examples/dll-user
• https://github.com/webpack/webpack/tree/master/examples/dll

[dsebastien]

Input from @christophercr :+1: I have already played with this feature and I have some findings: This is useful only in DEV mode since it makes the incremental builds a bit faster by having precompiled bundles (DLLs) that will not be re-bundled everytime something in the code changes. There is not a big difference in the speed the bundles are regenerated by webpack, just a couple of seconds faster. This change should be part of a major release in Stark since it involves some changes in the index.html file because of the Githubissues.

Githubissues is a development platform for aggregating issues.