Execute message derive macro

[CyberHoward]

📢 Type of change

▫️ Bugfix
▫️ New feature
▫️ Enhancement
▫️ Refactoring
▫️ Maintenance

📜 Description and Motivation

A derive macro that can be added to an ExecuteMsg struct to generate functions that can be called on the associated boot object.

Example:

#[cw_serde]
#[derive(ExecuteFns)]
pub enum ExecuteMsg{
    /// Freeze will make a mutable contract immutable, must be called by an admin
    Freeze {},
    /// UpdateAdmins will change the admin set of the contract, must be called by an existing admin,
    /// and only works if the contract is mutable
    UpdateAdmins { admins: Vec<String> },
    #[payable]
    Deposit {}
}

#[boot_contract(Empty,ExecuteMsg,Empty,Empty)]
struct Cw1

impl<Chain: BootEnvironment + Clone> Cw1<Chain> {
    pub fn test_macro(&self) {
        self.freeze().unwrap();
        self.update_admins(vec![]).unwrap(); 
        self.deposit(&[Coin::new(13,"juno")]).unwrap();
    }
}

🛠️ How to test (if applicable)

📝 Checklist

• Add flag for coins instead of optionals.

▫️ Reviewed submitted code
▫️ Added tests to verify changes
▫️ Updated docs
▫️ Verified on testnet

[adairrr]

Woah this is awesome!