feat(gnome-extensions): Add PK ID recipe input support (#249)

* chore(gnome-extensions): Make extension URL quering more robust

If there are multiple Gnome extensions with the same name, & they are compatible with Gnome version in the base image, then build will fail.

Previously, build would always fail if there are extensions with duplicate names.

* docs(gnome-extensions): Fix typo

* docs(gnome-extensions): Mention github repo

* fix(gnome-extensions): Version checking

* chore(gnome-extensions): Make operation order better for reading

* feat(gnome-extensions): Use new PK ID installation method

* fix(gnome-extensions): Unbound variable error

* fix(gnome-extensions): Legacy config order logic

* docs(gnome-extensions): Fix spacing

* docs(gnome-extension): Delete false-claim about better config readability

* chore(gnome-extensions): Add safe check for "null" in if `jq` parsing

* chore(gnome-extensions): Update uninstall step to use PK

This will break config for uninstalling extensions in literal names, but I bet that no one uses this feature yet since this extension is still new & fresh, so I'll just break it.

* Revert to the current module state

* docs(gnome-extensions): Add README details about missing gschema.compiled file

* chore(gnome-extensions): Introduce hybrid literal-name/PK config

If 2 or more same-named extensions are recommended, then user is recommended to use PK ID instead.

* chore(gnome-extensions): Ignore ShellCheck 2128 error, since it's harmless & intended

* chore(gnome-extensions): Also ignore harmless SC2178 notice

* chore(gnome-extensions): Use UUID for matching compiled.gschema workaround rather than extension name

* docs(gnome-extensions): Add note in module.yml that PK can be used

modules/gnome-extensions/module.yml

@@ -7,6 +7,12 @@ example: |
     - Night Theme Switcher
     - Blur my Shell # Notice how extension is named "Blur my Shell" & not "Blur My Shell"?
                     # Name is case-sensitive, so check if extension name is typed correctly
+    - AppIndicator and KStatusNotifierItem Support                
+    - 307 # Dash-to-Dock
+          # https://extensions.gnome.org/extension/307/dash-to-dock/
+          # You can also specify PK ID number from the extension URL,
+          # if you encounter the scenario where there are multiple extensions with the same name.
+          # You don't need to look & search for this scenario, since module will automatically fail & inform you to put PK ID number instead
   uninstall:
     - GSConnect # Uninstall step here should be used only for the extensions
                 # which are not installed through OS package manager in the base image,