[Storehouse] 011 - Add checkpoint iterate nodes function and util

[zhangchiqing]

This PR introduces a utility that streams a v6 or v7 checkpoint file and reports the total number of leaf and interim nodes. To minimize memory usage, it processes the checkpoint incrementally instead of loading the entire checkpoint into memory and reconstructing the trie.

While the initial use case is fairly specific, the implementation provides a generic checkpoint trie node iterator (ledger/complete/wal/checkpoint_node_iterator.go#IterateCheckpointNodes) that can be reused for other purposes. For example, it can be used to collect payload size statistics, group nodes by owner key, or support other checkpoint analysis tasks.

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