Merge cel-key into celestia-node

[jcstein]

What is the reasoning behind cel-key being separate from celestia-node? I’m working on a quickstart guide, and realized that even if someone installs the binary from a pre-built binary, there is no way to manage keys with just celestia-node. This was also something that @msuiche mentioned this week as a point of confusion when he was getting things setup.

if they need to be separate, then we should also publish prebuilt binaries of cel-key. but I think it would make most sense if you can manage keys with celestia-node, as it is the most intuitive way to do it.

[jcstein]

If I run a light node from pre-built binary, without having cel-key, it still generates a key for me. That being said, I do not understand the reasoning for splitting out cel-key from celestia.