[Proposal] Speed up minimum blocktime

[vicsn]

💥 Proposal

We should try to lower the minimum blocktime (when there is no traffic).

Currently MAX_BATCH_DELAY_IN_MS and MIN_BATCH_DELAY_IN_SECS artificially inflate minimum blocktime.

Some directions we can go:

• Simply lower either or both values to milliseconds
• Some of these adjustments might require us to change the type and/or meaning of the block timestamp. We could change it to milliseconds from a new consensus version onwards.

Previous work you can steal:

• a0d114b
• 75d7ebd
• 0fb75f1

Testing idea: when running X validators locally, do we also get 3.15 second blocktimes like on mainnet?