revert stream slicer from concurrent package

airbyte_cdk/sources/declarative/stream_slicers/stream_slicer.py

@@ -2,15 +2,18 @@
 # Copyright (c) 2023 Airbyte, Inc., all rights reserved.
 #
 
-from abc import ABC
+from abc import abstractmethod
+from dataclasses import dataclass
+from typing import Iterable
 
 from airbyte_cdk.sources.declarative.requesters.request_options.request_options_provider import (
     RequestOptionsProvider,
 )
-from airbyte_cdk.sources.streams.concurrent.partitions.stream_slicer import StreamSlicer as ConcurrentStreamSlicer
+from airbyte_cdk.sources.types import StreamSlice
 
 
-class StreamSlicer(ConcurrentStreamSlicer, RequestOptionsProvider, ABC):
+@dataclass
+class StreamSlicer(RequestOptionsProvider):
     """
     Slices the stream into a subset of records.
     Slices enable state checkpointing and data retrieval parallelization.
@@ -19,4 +22,11 @@ class StreamSlicer(ConcurrentStreamSlicer, RequestOptionsProvider, ABC):
 
     See the stream slicing section of the docs for more information.
     """
-    pass
+
+    @abstractmethod
+    def stream_slices(self) -> Iterable[StreamSlice]:
+        """
+        Defines stream slices
+
+        :return: List of stream slices
+        """