Chore: Migrate genesis file after upgrading to SDK v0.47

[glnro]

Problem

As detailed in #1950 , the SDK does not support validating previous versions of genesis files. Starting with v0.46 however, the genesis file migrate functionality was introduced. Once the Hub upgrades to v0.47, the original genesis.json for cosmoshub-4 can be migrated and updated in cosmos/mainnet.

Closing criteria

Genesis.json should be migrated to v0.47 once the upgrade with the version bump has taken place, then uploaded to cosmos/mainnet/genesis with the appropriate migration version distinction.

gaiad genesis migrate [target-version] [genesis-file] [flags]

[mpoke]

@MSalopek a reminder about this issue

[MSalopek]

https://github.com/cosmos/mainnet/tree/master/genesis has been archived for a while.

We can migrate the genesis but it's not clear if anyone uses it. The genesis file is not required to connect to an existing network if you are using node snapshots or statesync.