Add hie.yaml config file and enable ghcide support

[TerrorJack]

Is your feature request related to a problem? Please describe. For a long time, our official recommended IDE is ghcid, since it was relatively easy to set up a ghci prompt using various hacks. We needed hacks mainly because of the binaryen package links with a static C++ library which has all sorts of weird chemistries with the ghci runtime linker. We don't have that concern today, since binaryen now links with the system-provided binaryen C++ library, and ghci is capable of loading the .so file normally. As a result, asterius:lib can be properly loaded as a stack ghci target, and thus it should be supported by hie-bios out of the box.

It would smoothen developer experience a lot if we add official ghcide support. ghcid has served us well for a long time, but the supported features are indeed too limited.

Describe the solution you'd like

• [ ] Add hie.yaml for asterius and test it locally
• [ ] Set up ghcide (or something similar which is based on hie-bios) and its VSCode extension in the dev image

[TerrorJack]

I just gave ghcide a try. Seems nice (hover, goto, etc), but there's a problem: to avoid loading the .hs sources which aren't actually used by the host asterius package, we need to hand-write a multi-cradle hie.yaml config file. And it seems each executable target needs a new entry in hie.yaml, which makes it quite boilerplaty. Will look into this further before we switch away from ghcid to ghcide.

[JorisBlanken]

The ghcide project has been integrated with haskell-ide-engine and is now known as haskell-language-server.

Could you take a second look at this to see what's possible these days? Would love to be able to use the haskell language server for Asterius in vscode.