sketchybar: use finalpackage wrapper

Use finalPackage pattern with wrapper so that people who don't use the
service can benefit from the other options.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

modules/misc/news/2025/05/2025-05-22_18-47-11.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+{
+  time = "2025-05-22T23:47:11+00:00";
+  condition = pkgs.stdenv.hostPlatform.isDarwin;
+  message = ''
+    A new sketchybar module has been added.
+
+    - Simple configuration with a single `config` option that accepts the
+      configuration as lines, a file, or a directory.
+    - Support for both bash and lua configuration types
+    - `extraLuaPackages` option for additional Lua dependencies
+    - `extraPackages` option for additional runtime dependencies
+    - Integrated launchd service management
+  '';
+}