Add Workload state (#2564)

Co-authored-by: Daniel J. Beutel <[email protected]>

src/py/flwr/client/workload_state.py

@@ -0,0 +1,25 @@
+# Copyright 2023 Flower Labs GmbH. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Workload state."""
+
+from dataclasses import dataclass
+from typing import Dict
+
+
+@dataclass
+class WorkloadState:
+    """State of a workload executed by a client node."""
+
+    state: Dict[str, str]