new feature: Add CRC32C checksum support for GCS

### Feature Description

CRC32C is the algorithm recommended in the official documentation of GCS, and because OpenDAL S3 already provides a CRC32C checksum implementation, I think it is intuitive to add CRC32C checksum support to GCS.

### Problem and Solution

GCS Docs: https://cloud.google.com/storage/docs/data-validation.

### Additional Context

_No response_

### Are you willing to contribute to the development of this feature?

- [x] Yes, I am willing to contribute to the development of this feature.

Start with the existing CRC32C checksum implementation in OpenDAL S3 and the linked GCS data-validation documentation. Trace the GCS service implementation to determine where checksum support belongs; done means GCS supports CRC32C validation consistently with the requested behavior.

Written by the indexing model from the issue text.