add verbose stats to mlc-chat REST API (mlc-ai#1049)

* add verbose stats to mlc-chat REST API

* update docs

Author: denise-k

docs/deploy/rest.rst

@@ -89,6 +89,9 @@ The REST API provides the following endpoints:
 
    Get the latest runtime stats (encode/decode speed).
 
+.. http:get:: /verbose_stats
+
+   Get the verbose runtime stats (encode/decode speed, total runtime).
 
 Use REST API in your own program
 --------------------------------

python/mlc_chat/rest.py

@@ -327,6 +327,12 @@ async def read_stats():
     """
     return session["chat_mod"].stats()
 
+@app.get("/verbose_stats")
+async def read_stats_verbose():
+    """
+    Get the verbose runtime stats.
+    """
+    return session["chat_mod"].stats(verbose=True)
 
 ARGS = convert_args_to_argparser().parse_args()
 if __name__ == "__main__":