[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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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 55.80110% with 240 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...edger/complete/wal/checkpoint_v6_convert_stream.go	53.01%	108 Missing and 87 partials ⚠️
ledger/complete/wal/checkpoint_v6_convert.go	64.84%	23 Missing and 22 partials ⚠️

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