chore: Set ATUIN_ variables for development in devshell (#1653)

I accidentially broke my atuin database by executing `atuin` from the
PR I was working on without setting these variables and had to manually
roll back my local database.

That shouldn't happen, so we set the database and record store path in
the devshell to something that does not overwrite our normal databases.
We also warn if these files already exist, because when entering the
devshell, a user might want to start from a clean slate here.

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

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