crl-release-24.1: db,wal: avoid Batch.refData allocation #3570
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24.1 backport of #3565.
Passing in the Batch.refData func into (wal.Writer).WriteRecord forced an allocation for every committed batch. This commit defines a new wal.RefCount interface implemented by Batch to avoid the allocation.
Informs cockroachdb/cockroach#123236.