[WIP] Update LevelDB to version 1.23

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Any updates any soon?</issue_title>
<issue_description> This project looks rather abandoned. Are there any plans to make any updates, to at least start using the latest leveldb v1.23? I see there is a fork https://www.nuget.org/packages/LevelDBSharp that seems was created with this exact purpose but there are not many downloads, and I have doubts about switching to that one.

Thank you,
Alex
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