model-conversion : add missing curl script [no ci] (#15761)

This commit adds a curl script to the model-conversion examples
which is currently missing. This script is required for the running the
embedding server targets to test llama-server embeddings functionality.

examples/model-conversion/scripts/utils/curl-embedding-server.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+curl --request POST \
+    --url http://localhost:8080/embedding \
+    --header "Content-Type: application/json" \
+    --data '{"input": "Hello world today"}' \
+    --silent