Revive Stack build

[philderbeast]

Fixes #309. There's no Stackage snapshot for ghc-9.14.1, so set the snapshot via the compiler version and explicitly list all extra dependency versions, pretty much the same list as a cabal freeze would give.

Applies the workaround of renaming the internal dap library, commercialhaskell/stack#6920.

Note

Not tested on Windows.

[alt-romes]

Thanks @philderbeast!
Could you cherry-pick b97bc3a instead of your commit which renames it as dap-internal?

[mpilgrem]

To explain the existing approach:

• a custom 'GHC 9.14.1' snapshot built on top of nightly (with a revised compiler) is somewhat shorter than listing all the non-boot package versions;
• a distinct project-level configuration file is used for Windows (stack-windows.yaml), because of --enable-executable-dynamic (which is not applicable on Windows); and
• putting the custom snapshot into its own file (snapshot.yaml) reduces duplication between the Windows and non-Windows project-level configuration files.

[alt-romes]

I think mpilgrem's notes are quite important here ^

He had implemented the original Stack support and is a/the Stack maintainer.