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.

test/websocket/large_binary.wren

@@ -0,0 +1,69 @@
+// retoor <retoor@molodetz.nl>
+
+import "websocket" for WebSocket, WebSocketServer
+import "scheduler" for Scheduler
+import "timer" for Timer
+
+var port = 19877
+var payloadSize = 3 * 1024 * 1024
+var result = "pending"
+
+Scheduler.add {
+  var server = WebSocketServer.bind("127.0.0.1", port)
+  var ws = server.accept()
+
+  if (ws != null) {
+    var msg = ws.receive()
+    if (msg != null && msg.isBinary) {
+      ws.sendBinary(msg.bytes)
+    }
+    ws.close()
+  }
+  server.close()
+}
+
+Timer.sleep(50)
+
+Scheduler.add {
+  var ws = WebSocket.connect("ws://127.0.0.1:%(port)")
+
+  var payload = []
+  var i = 0
+  while (i < payloadSize) {
+    payload.add(i % 256)
+    i = i + 1
+  }
+
+  ws.sendBinary(payload)
+
+  var response = ws.receive()
+
+  if (response == null) {
+    result = "error: no response"
+  } else if (!response.isBinary) {
+    result = "error: not binary"
+  } else if (response.bytes.count != payloadSize) {
+    result = "error: size mismatch %(response.bytes.count) != %(payloadSize)"
+  } else {
+    var mismatch = false
+    i = 0
+    while (i < payloadSize) {
+      if (response.bytes[i] != (i % 256)) {
+        mismatch = true
+        break
+      }
+      i = i + 1
+    }
+    if (mismatch) {
+      result = "error: data mismatch at %(i)"
+    } else {
+      result = "ok"
+    }
+  }
+
+  ws.close()
+}
+
+Timer.sleep(30000)
+
+System.print(result) // expect: ok