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 <[email protected]>

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