chore: accept strings as arguments from command line without having to use Some()

[brunopgalvao]

When instantiating a contract that expects String's as arguments, Pop CLI fails:

For example, instantiating the PSP22 contract:

#[ink(constructor)]
pub fn new(
    supply: u128,
    name: Option<String>,
    symbol: Option<String>,
    decimals: u8,
) -> Self {
    let (data, events) = PSP22Data::new(supply, Self::env().caller()); // (2)
    let contract = Self {
        data,
        name,
        symbol,
        decimals,
    };
    contract.emit_events(events);
    contract
}

pop up contract --constructor new --args 10000000, "AWESOME", "AWE", 10

The following error is emitted:

┌   Pop CLI : Deploy a smart contract
│
■  An error occurred instantiating the contract: No variant 'AWESOME' found

For it to work, I need to wrap the strings in Some() with '' around so that zsh does not complain:

pop up contract --constructor new --args 10000000, 'Some("AWESOME")', 'Some("AWE")', 10