bcachefs: btree write buffer knows how to accumulate bch_accounting keys

bcachefs: btree write buffer knows how to accumulate bch_accounting keys

Teach the btree write buffer how to accumulate accounting keys - instead
of having the newer key overwrite the older key as we do with other
updates, we need to add them together.

Also, add a flag so that write buffer flush knows when journal replay is
finished flushing accounting, and teach it to hold accounting keys until
that flag is set.

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