EventIndex: Use a setting for the crawler sleep time.

src/settings/Settings.js

@@ -486,4 +486,9 @@ export const SETTINGS = {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
         default: RIGHT_PANEL_PHASES.GroupMemberList,
     },
+    "crawlerSleepTime": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        displayName: _td("How long should the crawler wait between requests"),
+        default: 3000,
+    }
 };