feat: adds bucket restore support

[JesseLovelace]

Adds support for bucket restore, bucket generation, hard delete time, soft delete time, listing/getting soft deleted buckets

gRPC not yet available, adding DNM tag until it is

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• samples/snippets/src/main/java/com/example/storage/bucket/GetSoftDeletedBucket.java:19, tag storage_get_soft_deleted_bucket
• samples/snippets/src/main/java/com/example/storage/bucket/ListSoftDeletedBuckets.java:19, tag storage_list_soft_deleted_buckets
• samples/snippets/src/main/java/com/example/storage/bucket/RestoreSoftDeletedBucket.java:19, tag storage_restore_soft_deleted_bucket

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