making crc32c as default

[shubhangi-google]

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closes: #<issue_number_goes_here>

[gemini-code-assist]

Summary of Changes

Hello @shubhangi-google, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the google-cloud-storage library to make CRC32C the default checksum algorithm for file uploads when no specific checksum is provided. This change simplifies file creation by automatically ensuring data integrity verification. The update includes modifications to the create_file method in the Bucket class and corresponding additions and adjustments to the test suite to validate the new default behavior across different file input types.

Highlights

• Default CRC32C Checksum: The create_file method in google-cloud-storage/lib/google/cloud/storage/bucket.rb now defaults to using crc32c as the checksum mechanism when no other checksum (CRC32C or MD5) is explicitly specified.
• Expanded Test Coverage: New test cases have been added to google-cloud-storage/test/google/cloud/storage/bucket_test.rb to validate that the create_file method correctly applies the crc32c default for various file types, including Tempfile and StringIO.
• Test Helper Alignment: The empty_file_gapi helper method within the test suite has been updated to reflect the new default crc32c behavior, ensuring consistency between the production code and test expectations.

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[gemini-code-assist]

Code Review

This pull request successfully implements crc32c as the default checksum for file uploads. The core logic change is correct. However, the accompanying test modifications introduce some fragility. Specifically, a test helper has been updated with a hardcoded value that may not be appropriate for all tests using it. I've provided suggestions to improve the robustness and maintainability of the tests by using a more sensible default and adjusting the tests accordingly. I've also included a minor style suggestion for the main implementation file.