perf(storage): use google_crc32c.value() for simpler crc32c calculation (#16761)

## Summary
- Simplified CRC32C calculation by using `google_crc32c.value()`.
- Improved code readability and reduced complexity in checksum logic.

Author: zhixiangli

packages/google-cloud-storage/google/cloud/storage/asyncio/retry/writes_resumption_strategy.py

@@ -84,8 +84,7 @@ def generate_requests(
 break
 
 checksummed_data=storage_type.ChecksummedData(content=chunk)
-checksum=google_crc32c.Checksum(chunk)
-checksummed_data.crc32c=int.from_bytes(checksum.digest(), "big")
+checksummed_data.crc32c=google_crc32c.value(chunk)
 
 request=storage_type.BidiWriteObjectRequest(
 write_offset=write_state.bytes_sent,

packages/google-cloud-storage/tests/unit/asyncio/retry/test_reads_resumption_strategy.py

@@ -17,7 +17,7 @@
 importunittest
 
 fromgoogle.api_coreimportexceptions
-fromgoogle_crc32cimportChecksum
+importgoogle_crc32c
 
 fromgoogle.cloudimport_storage_v2asstorage_v2
 fromgoogle.cloud._storage_v2.types.storageimportBidiReadObjectRedirectedError
@@ -77,8 +77,7 @@ def _create_response(
 checksummed_data=None
 ifcontentisnotNone:
 ifcrcisNone:
-c=Checksum(content)
-crc=int.from_bytes(c.digest(), "big")
+crc=google_crc32c.value(content)
 checksummed_data=storage_v2.ChecksummedData(content=content, crc32c=crc)
 
 read_range=None

packages/google-cloud-storage/tests/unit/asyncio/retry/test_writes_resumption_strategy.py

@@ -125,8 +125,7 @@ def test_generate_requests_checksum_verification(self, strategy):
 
 requests=strategy.generate_requests(state)
 
-expected_crc=google_crc32c.Checksum(chunk_data).digest()
-expected_int=int.from_bytes(expected_crc, "big")
+expected_int=google_crc32c.value(chunk_data)
 assertrequests[0].checksummed_data.crc32c==expected_int
 
 deftest_generate_requests_flush_logic_exact_interval(self, strategy):

packages/google-cloud-storage/tests/unit/asyncio/test_async_multi_range_downloader.py

@@ -19,7 +19,7 @@
 
 importpytest
 fromgoogle.api_coreimportexceptions
-fromgoogle_crc32cimportChecksum
+importgoogle_crc32c
 
 fromgoogle.cloudimport_storage_v2
 fromgoogle.cloud.storage.asyncioimportasync_read_object_stream
@@ -106,11 +106,8 @@ async def test_download_ranges_via_async_gather(
 self, mock_cls_async_read_object_stream, mock_random_int
  ):
 data=b"these_are_18_chars"
-crc32c=Checksum(data).digest()
-crc32c_int=int.from_bytes(crc32c, "big")
-crc32c_checksum_for_data_slice=int.from_bytes(
-Checksum(data[10:16]).digest(), "big"
- )
+crc32c_int=google_crc32c.value(data)
+crc32c_checksum_for_data_slice=google_crc32c.value(data[10:16])
 
 mock_mrd, _=awaitself._make_mock_mrd(mock_cls_async_read_object_stream)
 mock_random_int.side_effect= [456, 91011]
@@ -187,8 +184,7 @@ async def test_download_ranges(
  ):
 # Arrange
 data=b"these_are_18_chars"
-crc32c=Checksum(data).digest()
-crc32c_int=int.from_bytes(crc32c, "big")
+crc32c_int=google_crc32c.value(data)
 
 mock_mrd, _=awaitself._make_mock_mrd(mock_cls_async_read_object_stream)
 mock_random_int.side_effect= [456]