Request Data Columns When Fetching Pending Blocks

[nisdas]

What type of PR is this?

Feature

What does this PR do? Why is it needed?

We support fetching data columns when trying to process pending blocks, in order to be able to process these blocks we need to fetch the desired custody columns.

• Support filtering peers by those which custody our desired columns
• Allow pending blocks with columns to be correctly processed.

Which issues(s) does this PR fix?

N.A

Other notes for review

[nalepae]

Could be replaced by:

	if features.Get().EnablePeerDAS {
		request, err := s.pendingDataColumnRequestForBlock(blkRoot, b)
		if err != nil {
			return errors.Wrap(err, "pending data column request for block")
		}

		if len(request) > 0 {
			peers := s.getBestPeers()
			peers, err = s.getValidCustodyPeers(peers)
			if err != nil {
				return err
			}
			peerCount := len(peers)
			if peerCount == 0 {
				return errors.Wrapf(errNoPeersForPending, "block root=%#x", blkRoot)
			}
			if err := s.sendAndSaveDataColumnSidecars(ctx, request, peers[rand.NewGenerator().Int()%peerCount], b); err != nil {
				return err
			}
		}
	} else {
		request, err := s.pendingBlobsRequestForBlock(blkRoot, b)
		if err != nil {
			return errors.Wrap(err, "pending blobs request for block")
		}

		if len(request) > 0 {
			peers := s.getBestPeers()
			peerCount := len(peers)
			if peerCount == 0 {
				return errors.Wrapf(errNoPeersForPending, "block root=%#x", blkRoot)
			}
			if err := s.sendAndSaveBlobSidecars(ctx, request, peers[rand.NewGenerator().Int()%peerCount], b); err != nil {
				return err
			}
		}
	}

(Only one call to deatures.Get().EnablePeerDAS)

[nalepae]

This is not hardcoded.