Description

In Consensys/teku#6658, we can see a user debugging a late proposal between a Lighthouse VC and a Teku BN. It would be useful to have some more INFO level logging about when the VC is producing a block. It's a fairly infrequent operation and a very interesting one, so I doubt anyone will be annoyed by more logs here.

Some useful events might be:

• We realise we are going to produce a block.
• We request an unsigned block
• We receive the unsigned block
• We publish the signed block