Add ChainStorage test for DataColumnSidecars

[zilm13]

We have tests for BlobSidecars, but we have not added tests for DataColumnSidecars:

• onFinalizedBlocksAndBlobSidecars_shouldAcceptValidBlocks_startFromAnchorWithBlock
• onFinalizedBlocksAndBlobSidecars_shouldAcceptValidBlocks_startFromAnchorWithoutBlock
• onFinalizedBlocksAndBlobSidecars_shouldAcceptValidBlocks_inBatches

[rolfyone]

I'm not sure how we add this to chainStorage, as ChainStorage / StorageUpdate don't seem to have any mention of DAS...