feat: add manage_group param to *arr stack

- change hieradata/role/apps/media/* to use correct namespaces
- add manage_group boolean to all *arr stack modules

modules/readarr/manifests/install.pp

@@ -3,6 +3,7 @@ class readarr::install (
   $packages      = $readarr::packages,
   $user          = $readarr::user,
   $group         = $readarr::group,
+  $manage_group  = $readarr::manage_group,
   $base_path     = $readarr::base_path,
   $install_path  = $readarr::install_path,
   $config_folder = $readarr::config_folder,
@@ -21,8 +22,10 @@ class readarr::install (
     ensure_packages($packages, {ensure => 'installed'})
   }
 
-  group { $group:
-    ensure => present,
+  if $manage_group {
+    group { $group:
+      ensure => present,
+    }
   }
 
   user { $user: