[Storehouse] 010 Util convert v6 -> v7 checkpoint

[zhangchiqing]

To bootstrap a payloadless EN, a v7 root checkpoint file is needed. This PR adds a util to convert a v6 root checkpoint into a v7 root checkpoint.

It adds two ways to convert:

1. original way (less code, but use more memory), it loads the entire v6 checkpoint into memory, and then convert it into v7
2. steam way (more new code, but much less memory), it iterate each node in the v6 checkpoint file, if it's a leaf node, convert it into v7 format.

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 28dd035b-3a71-44d9-9782-b3e08909e789

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch leo/payloadless-util-convert-checkpoint

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}