MDL-57791 analytics: Changes after review

- Split model::predict in parts
- JS promises updated according to eslint-plugin-promise
- New API methods replacing direct DB queries
- Reduce insights nav link display cost
- Increase time limit as well as memory for big processes
- Move prediction action event to core
- Dataset write locking and others
- Refine last time range end time
- Removed dodgy splitting method id to int
- Replace admin_setting_predictor output_html overwrite for write_setting overwrite
- New APIs for access control
- Discard invalid samples also during prediction

admin/settings/analytics.php

@@ -45,7 +45,7 @@ if ($hassiteconfig) {
         $logmanager = get_log_manager();
         $readers = $logmanager->get_readers('core\log\sql_reader');
         $options = array();
-        $defaultreader = false;
+        $defaultreader = null;
         foreach ($readers as $plugin => $reader) {
             if (!$reader->is_logging()) {
                 continue;