feat: custom init command

[daeMOn63]

This allows to generate a default genesis closer to fetch.ai default network settings.

It's a full clone of x/genutil/client/cli/init.go, with:

• a default genesis defined with most of our network settings
• an extension of --staking-bond-denom flag, which will now set the default denom on all other modules (gov / mint / staking / crisis)

Also align the default genesis gov vote and deposit time to 5 days, from recent mainnet change.