Added example for multimodal embedding (#4206)

Co-authored-by: Chayenne <zhaochen20@outlook.com>

examples/runtime/multimodal_embedding.py

@@ -0,0 +1,21 @@
+# launch server
+# python -m sglang.launch_server --model-path Alibaba-NLP/gme-Qwen2-VL-2B-Instruct --is-embedding --chat-template gme-qwen2-vl
+
+import requests
+
+url = "http://127.0.0.1:30000"
+
+text_input = "Represent this image in embedding space."
+image_path = "https://huggingface.co/datasets/liuhaotian/llava-bench-in-the-wild/resolve/main/images/023.jpg"
+
+payload = {
+    "model": "gme-qwen2-vl",
+    "input": [
+        {"type": "text", "text": text_input},
+        {"type": "image", "url": image_path},
+    ],
+}
+
+response = requests.post(url + "/v1/embeddings", json=payload).json()
+
+print("Embeddings:", [x.get("embedding") for x in response.get("data", [])])