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fix(initializer): download only the objects under the S3 prefix

S3Storage.download listed the bucket with the storage URI path as the prefix
and downloaded everything that came back. OpenDAL, like S3 ListObjects,
matches the prefix as a plain string, so s3://bucket/models/llama also
returned models/llama-2/... and models/llama2-7b/..., and the relative path
computed by slicing off the prefix placed them at -2/config.json and
2-7b/config.json inside the destination. The documented URI form has no
trailing slash, so this was the default outcome for any bucket with sibling
prefixes.

Keep only the object the prefix names and the objects below it, and compute
the relative path from the prefix without its trailing slash so both forms
produce the same layout.

Signed-off-by: Vidyansh <ezboi2312@gmail.com>