Componentize the whole keypairoom flow in just one component

[bbtgnn]

I would like to have a root <KeypairoomFlow> that returns the keypair at the very end.
As a prop, it accepts the onEnd(keypair) function, so the user can do what it wants.

The flow is:

graph TD;
    login-->questions;
    login-->passphrase;
    questions-->seed;
    seed-->onEnd;
    passphrase-->onEnd;

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Ideally, it would be nice to export slots for components, so that there's just the logic