feat: Add slashcommand api

toju-app/public/plugins/e2e-all-api/toju.plugin.json

@@ -50,6 +50,7 @@
     "ui.channelsSection",
     "ui.embeds",
     "ui.dom",
+    "ui.commands",
     "storage.local",
     "storage.serverData.read",
     "storage.serverData.write",
@@ -91,7 +92,8 @@
   "ui": {
     "settingsPages": ["coverage"],
     "sidePanels": ["coverage"],
-    "channelSections": ["coverage"]
+    "channelSections": ["coverage"],
+    "slashCommands": ["e2e-echo", "e2e-ping"]
   },
   "pluginUser": {
     "displayName": "E2E Plugin Bot",