Propagate block headers and bodies through separate gossipsub topics

[styppo]

The current gossipsub topic structure for block propagation suffers from poor mesh quality on the block-header topic, duplicated messages due to re-publishing as well as data duplication across topics.

This PR replaces the block/block-header gossipsub topics by a block-header and a block-body topic, eliminating cross topic data duplication. All nodes subscribe to the block-header topic, improving mesh quality, while only full/history nodes subscribe to the block-body topic.

Additionally, validators and next_batch_initial_punished_set are moved from the macro body to the macro header while preserving circuit compatibility. These properties are always required by light nodes, so they need to be part of the header.

Closes #2499, closes #2560