feat(storage): enable CRC32C validation by default in transfer manager

[thiyaguk09]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Code Review

This pull request enables CRC32C validation by default for the downloadFileInChunks method in the TransferManager class. It updates the DownloadFileInChunksOptions interface to accept boolean values, modifies the implementation to default to 'crc32c' validation, and ensures that validation is suppressed for individual sharded chunks to avoid redundant checks. The changes also include updated JSDoc documentation and comprehensive unit tests to verify the new default behavior and the ability to disable validation. Feedback was provided to update the JSDoc type for the validation property to use the specific 'crc32c' literal for consistency with the interface definition.