Address three related ownership consistency issues:
1. CreateNamespace now sets OwnerAccountID to bucketMetadata.OwnerAccountID
instead of request principal. This prevents namespaces created by
delegated callers (via bucket policy) from becoming unmanageable, since
ListNamespaces filters by bucket owner.
2. CreateTable now:
- Fetches bucket metadata to use correct owner for bucket policy evaluation
- Uses namespaceMetadata.OwnerAccountID for namespace policy checks
- Uses bucketMetadata.OwnerAccountID for bucket policy checks
- Sets table OwnerAccountID to namespaceMetadata.OwnerAccountID (inherited)
3. GetTable now:
- Fetches bucket metadata to use correct owner for bucket policy evaluation
- Uses metadata.OwnerAccountID for table policy checks
- Uses bucketMetadata.OwnerAccountID for bucket policy checks
This ensures:
- Bucket owner retains implicit "owner always allowed" behavior even when
evaluating bucket policies
- Ownership hierarchy is consistent (namespace owned by bucket, table owned by namespace)
- Cross-principal delegation via policies doesn't break ownership chains
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