Clean, generic, language-agnostic cross-compilation-aware core build infrastructure

[shlevy]

TODO @Ericson2314 fill this out

1. Make mkDerivation a wrapper that desugars the legacy input names as proposed above. No more {propagated,}{Native,}BuildInputs in bash.

2. Move away from autoconf terminology to build, run, emit (isomorphic renaming).

3. Make env hooks more coarse-grained, I see no use for the second axis for them.

Action item from #35543

[stale]

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[siraben]

Any updates on this?

[Ericson2314]

I would say I never filled this out, and the first steps are tracked in issue #28327 and PR #72074. Perhaps we want larger changes, but I'd say that hinges on larger cleanups of Nixpkgs in general.