[Feature]: x/gov allow staked tokens as a bond

[BrendanChou]

Proposed Feature

Allow staked tokens to be used as a bond for a governance vote.

Problem Definition

No one wants to inventory unstaked tokens for the purposes of a gov bond, making it more difficult to get depositors to initiate or start gov votes. The more knowledgable and active users are stakers, who would be willing to use their staked tokens as a bond.

This has been an issue in several Cosmos chains including dYdX and Osmosis

Possible Considerations

It seems to me this would require the unbonding period of x/staking to be longer than the deposit+vote period of x/gov. It may also be easier to implement if it requires the full bond to be posted at once (rather than allowing for additional deposits from other accounts).