feat: add example scripts for argparse, bytes, dataset, html, markdown, uuid, wdantic, and web chat modules

Add comprehensive demo scripts showcasing the usage of multiple Wren modules including argument parsing, byte manipulation, in-memory dataset operations, HTML encoding/slugification, markdown-to-HTML conversion, UUID generation/validation, schema validation with wdantic, and a full web chat application with REST endpoints.

example/web_demo.wren

@@ -0,0 +1,58 @@
+// retoor <retoor@molodetz.nl>
+
+import "web" for Application, Response, View
+import "json" for Json
+
+class HelloView is View {
+  get(request) {
+    return Response.text("Hello, World!")
+  }
+}
+
+class ApiView is View {
+  get(request) {
+    var data = {"message": "API response", "method": "GET"}
+    return Response.json(data)
+  }
+
+  post(request) {
+    var body = request.json
+    var data = {"message": "Data received", "received": body}
+    return Response.json(data)
+  }
+}
+
+class UserView is View {
+  get(request) {
+    var userId = request.params["id"]
+    return Response.json({"user_id": userId, "action": "get"})
+  }
+}
+
+var app = Application.new()
+
+app.get("/", Fn.new { |req|
+  return Response.html("<h1>Welcome to Wren Web!</h1><p>A simple web framework.</p>")
+})
+
+app.addView("/hello", HelloView)
+app.addView("/api", ApiView)
+app.addView("/users/:id", UserView)
+
+app.get("/greet/:name", Fn.new { |req|
+  var name = req.params["name"]
+  return Response.text("Hello, " + name + "!")
+})
+
+app.get("/session", Fn.new { |req|
+  var count = req.session["count"]
+  if (count == null) count = 0
+  count = count + 1
+  req.session["count"] = count
+  return Response.json({"visit_count": count})
+})
+
+app.static_("/static", "./static")
+
+System.print("Starting server...")
+app.run("0.0.0.0", 8080)