Add BadgerDB driver about kine HOT 4 OPEN

This sounds interesting. Some things to consider first. Kine exposes an etcd style abstracted on (right now) SQL backends. Even though etcd is a key value store, it's actually hard to reproduce the behavior of etcd on an arbitrary k/v (at least I haven't figured it out yet). The reason is that Kubernetes is very tied to the way etcd works with revision counters. There is a basic assumption that a historical record of changes is available and that one can query them for a short period of time. So internally what you want out of a data store is to be able to store a log of changes and then to be able to query that log easily. So in SQL it's quite easy to do. I haven't thought of a simple approach in a k/v store yet but also haven't given a lot of thought to it. Obviously it's possible, just might be a bit more work than one would expect.

Also, this code base is very poorly documented, sorry.

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I've spent some time reading about etcd's data-model; indeed it's a bit more complex than I expected after looking at sqlite's driver but still doable. Will try to sketch up a PR.

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What about using bbolt directly (https://github.com/etcd-io/bbolt) as an embedded DB? Dunno if it would work... just a thought :)

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Minor note, the latest version of BadgerDB, from v3.2103.1 onward, is now using a pure go zstd dependency.

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