[Hardware/Nvidia] Add better NVidia GPU support, including proprietary drivers

hardware/nvidia/default.nix

@@ -0,0 +1,6 @@
+{config, ...}:
+{
+  imports = [
+    ./vgpu.nix
+  ];
+}

hardware/nvidia/vgpu.nix

@@ -0,0 +1,19 @@
+{config, pkgs, lib, ...}:
+with lib;
+let
+  cfg = config.aviallon.hardware;
+  useVgpu = (cfg.useProprietary &&
+            (cfg.gpuVendor == "nvidia") &&
+            (versionOlder config.boot.kernelPackages.kernel.version "5.10"));
+in
+{
+  imports = [
+    <nixos-nvidia-vgpu>
+    # (optional useVgpu (builtins.fetchTarball "https://github.com/danielfullmer/nixos-nvidia-vgpu/archive/master.tar.gz"))
+  ];
+
+  config = mkIf useVgpu {
+    hardware.nvidia.vgpu.enable = true; # Enable NVIDIA KVM vGPU + GRID driver
+    hardware.nvidia.vgpu.unlock.enable = true; # Unlock vGPU functionality on consumer cards using DualCoder/vgpu_unlock project.
+  };
+}