feat(proxy_server.py): expose new permissions field for keys

.pre-commit-config.yaml

@@ -1,10 +1,10 @@
 repos:
 -   repo: https://github.com/psf/black
-    rev: stable
+    rev: 24.2.0
     hooks:
     - id: black
 -   repo: https://github.com/pycqa/flake8
-    rev: 3.8.4  # The version of flake8 to use
+    rev: 7.0.0  # The version of flake8 to use
     hooks:
     -  id: flake8
        exclude: ^litellm/tests/|^litellm/proxy/proxy_cli.py|^litellm/integrations/|^litellm/proxy/tests/