Allow sideloading CRX extensions if developer mode is enabled

Back in chromium 70 and below (and derivatives) everyone could easily sideload extensions. However, the Chromium developers removed that feature due to complaints about malware.

I am starting to develop extensions and think that if people have developer mode enabled, it should let them sideload CRX files.

This would be helpful so that developers like me who want to test their extensions in a Chromium based browser could do so, and also install extensions not on the CWS.