nixos/pulseview: init module

Pulseview needs the libsigrok udev rules to be installed, this module
removes the need for the enduser to think about this dependency.

nixos/modules/module-list.nix

···
   ./programs/pqos-wrapper.nix
   ./programs/projecteur.nix
   ./programs/proxychains.nix
+  ./programs/pulseview.nix
   ./programs/qdmr.nix
   ./programs/qgroundcontrol.nix
   ./programs/qt5ct.nix

nixos/modules/programs/pulseview.nix

···
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.programs.pulseview;
+in
+{
+  options.programs.pulseview = {
+    enable = lib.mkEnableOption "pulseview, a sigrok GUI";
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [
+      pkgs.pulseview
+    ];
+
+    services.udev = {
+      packages = [
+        # Pulseview needs some udev rules provided by libsigrok to access devices
+        pkgs.libsigrok
+      ];
+    };
+  };
+}