[Storehouse] 014 - Payloadless util create v6 checkpoint from v7

[zhangchiqing]

To be able to support mode switch especially switching from payloadless mode back to full node, we need to create a v6 checkpoint from a v7 checkpoint, so that we can simply converting the latest v7 checkpoint produced by a EN running in payloadless mode, and then restart in full node mode with the converted v6 checkpoint file. Since the wal file format didn't change, they can be reused by the full node to resume the execution.

This PR adds a util to create a v6 checkpoint from a v7 (payloadless) checkpoints and wal (write ahead logs) files.

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