lib/modules: Implement module-builtin assertions

This implements assertions/warnings supported by the module system directly,
instead of just being a NixOS option (see
nixos/modules/misc/assertions.nix).

This has the following benefits:
- It allows cleanly redoing the user interface. The new
  implementation specifically allows disabling assertions or
  converting them to warnings instead.
- Assertions/warnings can now be thrown easily from within
  submodules, which previously wasn't possible and needed workarounds.

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