add `dub publish` / `dub release`

[WebFreak001]

trafficstars

This is an idea to add something similar to dotnet publish to DUB

In its simplest form it would be a lot like just dub build - the differences would be:

• add suffix / different folder for each platform/architecture
• option to include lib[lg]?phobos.(dylib|so|dll) in the output path (self contained executables)
• extra distribution ideas:
  • building AppImages
  • building snaps (see #999)

additional future ideas:

• potentially support cross compilation

use cases include:

• generating ready-to-share folders (zippable) for application distribution
• batch-creating libraries for a variety of operating systems and architectures easily (like for using with autowrap)