feat: user defined custom tools as part of workflow execution (#94)

* feat: add custom tools functionality

* Show tools in nodes

* integrate tool calling with pipeline engine

ui/src/components/layout/AppSidebar.tsx

@@ -16,6 +16,7 @@ import {
   Star,
   TrendingUp,
   Workflow,
+  Wrench,
   Zap,
 } from "lucide-react";
 import Link from "next/link";
@@ -108,6 +109,11 @@ export function AppSidebar() {
           url: "/telephony-configurations",
           icon: Phone,
         },
+        {
+          title: "Tools",
+          url: "/tools",
+          icon: Wrench,
+        },
         // {
         //   title: "Integrations",
         //   url: "/integrations",