Prop 4818: Chain Upgrade v2.12

This governance proposal aims to upgrade Terra's mainnet to version 2.12.4. Key Changes:

1. Update Validator Minimum Commission Rate to 5%
2. Burning of TFL's LUNA and IBC exploiter assets
3. Removal of blacklist functionality

Agora post: https://commonwealth.im/terra/discussion/24445-terra-chain-upgrade-v2121 Upgrade height countdown: https://ping.pub/terra/block/11860000 GitHub release: https://github.com/terra-money/core/releases/tag/v2.12.4