## Description

We used to store the console files (history and current author) in a
subdirectory `console` under the iroh data dir. This got lost in some
refacorings, and the console files currently are created in the iroh
data directory directly.

This is bad because the iroh data directory is a single namespace, and
we should use it cautiously.

This PR goes back to using a `console` subdirectory. Existing files are
migrated on first start of the console.

Based on #2299 because this already made the environment init functions
async.

## Breaking Changes

<!-- Optional, if there are any breaking changes document them,
including how to migrate older code. -->

## Notes & open questions

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## Change checklist

- [ ] Self-review.
- [ ] Documentation updates if relevant.
- [ ] Tests if relevant.
- [ ] All breaking changes documented.