MDL-73397 adminpresets: Create new core_adminpresets component

The core_adminpresets component has been added and some data and
methods from the tool_admin_presets have been moved here.

lib/tests/component_test.php

@@ -36,7 +36,7 @@ class component_test extends advanced_testcase {
      * this is defined here to annoy devs that try to add more without any thinking,
      * always verify that it does not collide with any existing add-on modules and subplugins!!!
      */
-    const SUBSYSTEMCOUNT = 74;
+    const SUBSYSTEMCOUNT = 75;
 
     public function setUp(): void {
         $psr0namespaces = new ReflectionProperty('core_component', 'psr0namespaces');