feat(data-classes): data_as_bytes prop KinesisStreamRecordPayload (#628)

Author: Jurong Huang

Diff for: aws_lambda_powertools/utilities/data_classes/kinesis_stream_event.py

@@ -31,9 +31,13 @@ def sequence_number(self) -> str:
         """The unique identifier of the record within its shard"""
         return self["kinesis"]["sequenceNumber"]
 
+    def data_as_bytes(self) -> bytes:
+        """Decode binary encoded data as bytes"""
+        return base64.b64decode(self.data)
+
     def data_as_text(self) -> str:
         """Decode binary encoded data as text"""
-        return base64.b64decode(self.data).decode("utf-8")
+        return self.data_as_bytes().decode("utf-8")
 
     def data_as_json(self) -> dict:
         """Decode binary encoded data as json"""

Diff for: tests/functional/test_data_classes.py

@@ -1077,6 +1077,7 @@ def test_kinesis_stream_event():
     assert kinesis.partition_key == "1"
     assert kinesis.sequence_number == "49590338271490256608559692538361571095921575989136588898"
 
+    assert kinesis.data_as_bytes() == b"Hello, this is a test."
     assert kinesis.data_as_text() == "Hello, this is a test."