Async eval callback

.github/workflows/pytest-gpu.yaml

@@ -55,7 +55,6 @@ jobs:
       run: |
         set -ex
         python -m pip install mosaicml-cli
-        mcli init --mcloud
         mcli version
     - name: Submit Run
       id: tests

llmfoundry/callbacks/__init__.py

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 try:
+    from llmfoundry.callbacks.async_eval_callback import AsyncEval
     from llmfoundry.callbacks.eval_gauntlet_callback import EvalGauntlet
     from llmfoundry.callbacks.fdiff_callback import FDiffMetrics
     from llmfoundry.callbacks.generate_callback import Generate
@@ -28,4 +29,5 @@
     'EvalGauntlet',
     'ModelGauntlet',
     'HuggingFaceCheckpointer',
+    'AsyncEval',
 ]