bcachefs: opts.large_journal

By default the maximum per-device journal is 8GB (and this should
probably be revised for large memory machines).

When debugging we often want as much history as possible so that we can
reconstruct a full sequence of events: enabling this option raises the
limit to 32GB, at the expense of slower recovery from unclean shutdown.

Users with mixed ssd/hdd setups may want to ensure that only the ssds
are used for journalling, via the data_allowed option (note that we
don't yet have an easy way to remove a journal from an existing device).

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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