Implement Asterius Hackage Overlay

[TerrorJack]

Is your feature request related to a problem? Please describe. This is the tracking issue for the Asterius Hackage Overlay.

Describe the solution you'd like We should implement and host a Hackage overlay, similar to head.hackage and mobile haskell overlay. The reason is:

• We already patch some boot libs anyway. Moving the patches to the overlay can simplify and speed up the booting process, since the patched packages can be installed by ahc-cabal along with the unpatched ones.
• Some of the packages on Hackage require patching to work. A Hackage overlay is a principled way of maintaining patched packages.