feat(cometbft): mitigate slow blocks due to inactive validators

[corverroos]

Decreases default cometBFT consensus config param timeout_propose from 3s to 1s.

This aim to mitigate slow blocks when the proposing validator is offline/inactive. Currently, when 1 of 3 validators are offline, the block times on staging decreases from 1s to 4s.

I had a look at some other cosmos chains and aligning timeout_commit and timeout_propose seems to be common practice:

• Sei: timeout_commit=200ms, timeout_propose=300s
• Moonbridge and kopi: timeout_commit=1s, timeout_propose=1s

This change aims to mitigate the affect of offline validators on block times.

issue: #1812

[corverroos]

See block times slow down when 1of3 validators were offline in staging