code: Replace Node trait with more flexible solution or remove it altogether

[romac]

The Node trait is clunky at best right now, as it hardcodes the app configuration type, enforces the loading of the private from a file (and therefore wouldn't support something like TMKMS), and contains a useless run method that is only useful for the test CLI crate.

[namn-grg]

Hi, can I take this?
whats the best way to go forward, should I remove the trait or keep a very minimal trait

[romac]

Hi, thanks for the offer, but we need to reflect more on what the final solution would look like before anyone can actually work on this.

[romac]

But if you have ideas, we are all ears! Feel free to discuss them here or open a PR to showcase them. I just can't provide you with a final design as of now.