[CLI] Support http config (#3505)

Right now requires that the file be in one of the local
packages/dependencies.

libs/cli/langgraph_cli/cli.py

@@ -650,6 +650,7 @@ def dev(
         store=config_json.get("store"),
         wait_for_client=wait_for_client,
         auth=config_json.get("auth"),
+        http=config_json.get("http"),
     )