Implement check for the compile-time and runtime GHC version

Currently Stan panics when GHC versions are different. But it's possible to implement a check with a good error message. This check wouldn't be needed if the following GHC feature was implemented:

* https://gitlab.haskell.org/ghc/ghc/-/issues/18329

However, it doesn't look like it will be implemented soon, so providing a better UX is worth spending time on 🙂

For the implementation, we should use `ghc-check` by @pepeiborra. The package already does an excellent job on covering all tricky cases, and it's used in `ghcide`.

* http://hackage.haskell.org/package/ghc-check

Start by reading the ghc-check package documentation and its use in ghcide, then inspect Stan's handling of GHC versions. Implement a check for differences between compile-time and runtime GHC versions and verify that Stan reports a useful error instead of panicking.

Written by the indexing model from the issue text.