External CosmWasm chain with IBCHooks

This doesn't require QueryMsg, but requires ExecuteMsg as well as Strategy contract described here

#[cw_serde]
pub enum ExecuteMsg {
    Stake(StakeMsg),
    Unstake(UnstakeMsg),
    Epoch(EpochMsg),
}

#[cw_serde]
pub struct StakeMsg {}

#[cw_serde]
pub struct UnstakeMsg {
    pub amount: Uint128,
}

#[cw_serde]
pub struct EpochMsg {}