refactor(meta): prefixed auto full GC

[zwang28]

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What's changed and what's your intention?

After introducing time travel, there is expected to be much more objects in object store. To reduce the overhead associated with scanning the entire data direcoty during auto full GC, this PR refines auto full GC by adding a rotational prefix when listing objects.

Note that the path to an object within a cluster can either be data_dir/shard_id/object_name or data_dir/object_name, depending on the specific configuration settings. The setting is not straightforward to obtain. So by default this fine-grain auto full GC is not enabled. It should be set later accordingly.

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