feat: Support multiple credentials write API

config-templates/module_proxystatistics.php

@@ -104,6 +104,16 @@ $config = [
      */
     //'apiWritePasswordHash' => password_hash('ap1Wr1T3rP@S$'),
 
+    /*
+     * Map of credentials for API writer (has no effect if write is disabled).
+     * Either apiWriteUsername and apiWritePasswordHash or this array has to contain valid credentials pair.
+     */
+
+    //'apiWriters' => [
+    // 'api_writer' => password_hash('ap1Wr1T3rP@S$'),
+    // 'api_writer2' => password_hash('ap1Wr1T3rP@S$'),
+    //],
+
     /*
      * List of IDP and/or SP EntityIDs for which the login statistic will be ignored even
      * when requested to be instered into the storage. By default lists are empty