Dynamically subscribe to data column subnets

[nflaig]

Right now we always subscribe to all data column sidecars which means no matter if you are supernode or not we receive and propagate all data columns.

lodestar/packages/beacon-node/src/network/gossip/topic.ts

Lines 245 to 248 in f124be0

	if (ForkSeq[fork] >= ForkSeq.fulu) {
	// TODO: @matthewkeil check if this needs to be updated for custody groups
	for (let subnet = 0; subnet < DATA_COLUMN_SIDECAR_SUBNET_COUNT; subnet++) {
	topics.push({type: GossipType.data_column_sidecar, subnet});

It should probably work similar to attestation / sync committee subnets which are dynamic, ie. in case of data column subnets we need to adapt based on validator custody requirement.

There might be one edge case if we are proposer as we need to publish columns for all subnets.

[wemeetagain]

Resolved by #8181