add chunk timing example

examples/stream_chunk_timing.py

@@ -0,0 +1,44 @@
+import asyncio
+import time
+
+from codeboxapi import CodeBox, ExecChunk
+
+
+def sync_stream_exec(cb: CodeBox) -> None:
+    chunks: list[tuple[ExecChunk, float]] = []
+    t0 = time.perf_counter()
+    for chunk in cb.stream_exec(
+        "import time;\nfor i in range(3): time.sleep(1); print(i)"
+    ):
+        chunks.append((chunk, time.perf_counter() - t0))
+
+    for chunk, t in chunks:
+        print(f"{t:.5f}: {chunk}")
+
+
+async def async_stream_exec(cb: CodeBox) -> None:
+    chunks: list[tuple[ExecChunk, float]] = []
+    t0 = time.perf_counter()
+    async for chunk in cb.astream_exec(
+        "import time;\nfor i in range(3): time.sleep(1); print(i)"
+    ):
+        chunks.append((chunk, time.perf_counter() - t0))
+
+    for chunk, t in chunks:
+        print(f"{t:.5f}: {chunk}")
+
+
+print("remote")
+cb = CodeBox()
+sync_stream_exec(cb)
+asyncio.run(async_stream_exec(cb))
+
+print("local")
+local = CodeBox(api_key="local")
+sync_stream_exec(local)
+asyncio.run(async_stream_exec(local))
+
+print("docker")
+docker = CodeBox(api_key="docker")
+sync_stream_exec(docker)
+asyncio.run(async_stream_exec(docker))