Extend DOMStore and DOMStoreTransactionChain contract with compaction awareness. This means defining this method:

    default DOMStoreThreePhaseCommitCohort compact(YangInstanceIdentifier path) {
        return newWriteOnlyTransaction().ready();
    }

in both of these interfaces. The method needs to be documented with exact semantics (see MDSAL-848 for details) with guidance that DOMStore implementations should implement it.

This task should be followed-up with making this method non-default, hence mandatory-to-implement.