feat(gsr): add gsr-dbus-server package

packages/gpu-screen-recorder/gsr-dbus-server.nix

@@ -0,0 +1,14 @@
+{
+  callPackage,
+  gpu-screen-recorder-src,
+  ...
+}:
+callPackage ./generic.nix {
+  pname = "gsr-dbus-server";
+  inherit gpu-screen-recorder-src;
+
+  description = ''
+    Small program to move dbus code to a separate process to allow gpu-screen-recorder to
+    use cap_sys_nice for better recording performance on AMD.
+  '';
+}