[Backport 1.28.x] Google Cloud Storage blob store implementation #1439
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Add support for storing tiles in Google Cloud Storage buckets, similar to the existing S3 and Azure blob stores. Tiles are organized using the standard TMS key structure. Authentication works through Application Default Credentials (the recommended approach for GCP), API keys, or anonymously for emulators. All configuration parameters support environment variable expansion. Delete operations run asynchronously and use the GCS batch API for efficiency when removing tile ranges or entire layers. This keeps the main request threads responsive during bulk operations. Includes tests using testcontainers with fake-gcs-server, comprehensive javadocs, and user documentation.
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Backport #1435
Authored by: @groldan