feat: add cJSON and SQLite amalgamation source files under deps/

Add the cJSON library (cJSON.c, cJSON.h) and SQLite amalgamation
(sqlite3.c, sqlite3.h, sqlite3ext.h, shell.c) as vendored dependencies
in the deps/ directory for use by the project build system.

example/websocket_demo.wren

@@ -0,0 +1,23 @@
+// retoor <retoor@molodetz.nl>
+
+import "websocket" for WebSocket
+
+System.print("=== WebSocket Client Demo ===\n")
+
+System.print("Connecting to ws://127.0.0.1:8080...")
+var ws = WebSocket.connect("ws://127.0.0.1:8080")
+System.print("Connected\n")
+
+System.print("--- Sending Text Message ---")
+ws.send("Hello WebSocket!")
+var msg = ws.receive()
+System.print("Received: %(msg.text)")
+
+System.print("\n--- Sending Binary Message ---")
+ws.sendBinary([72, 101, 108, 108, 111])
+msg = ws.receive()
+System.print("Received bytes: %(msg.bytes)")
+
+System.print("\n--- Closing Connection ---")
+ws.close(1000, "Client closing")
+System.print("Connection closed")