MDL-83469 core_courseformat: alternative new_module actions

The previous create_module actions uses section number instead of
section id. This produces several bugs when sections are moved around
the course in edit mode. This issue implements a new_module action with
all related mutations and webservices. The new one uses section id
instead of section number.

course/format/tests/external/create_module_test.php

@@ -69,6 +69,7 @@ final class create_module_test extends \externallib_advanced_testcase {
 
         // Execute course action.
         $results = json_decode(create_module::execute((int)$course->id, $modname, (int)$targetsection->id, (int)$activity->id));
+        $this->assertDebuggingCalled();
 
         // Check result.
         $cmupdate = $this->find_update_by_fieldname($results, 'put', 'cm', get_string('quickcreatename', 'mod_' . $modname));
@@ -122,6 +123,7 @@ final class create_module_test extends \externallib_advanced_testcase {
         // Execute course action.
         $modname = 'book';
         create_module::execute((int)$course->id, $modname, (int)$targetsection->id);
+        $this->assertDebuggingCalled();
     }
 
     /**