Finalize non-empty blocks by proactively creating the next block, even if it is empty

[s8sato]

I don’t ask for crypto. M◉⃤|<𓊖༒𓊖 Takemiya 武宮誠 (Sora.org & SORAMITSU), [2025/02/14 2:59]
Looking at http://s1.dev.iroha2.iroha.tech:8080, it seems that Iroha 2 isn't working as expected. There should always be an empty block after a timeout if there are not transactions, but I don't see one here

I don’t ask for crypto. M◉⃤|<𓊖༒𓊖 Takemiya 武宮誠 (Sora.org & SORAMITSU), [2025/02/14 3:00]
It's needed because sumeragi doesn't have a secondary commit phase because we are a blockchain protocol and it is expected there will always be another block. If there are no transactions after a timeout period from the previous block with transactions, then an empty block should be created to commit and finalize the previous block. This works because to commit a new block you need 2f+1 signatures, so it proves a majority of the network has the previous block and allows for transaction finality.