feat: Liquorice executor

[markin-io]

Executor logic for Liquorice RFQ protocol https://liquorice.tech/

[dianacarvalho1]

Thank you! Overall it looks good to me! Only left small comments

[dianacarvalho1]

when running through the tycho router, address(this) represents the tycho router and not the executor. Can we clean up this comment a bit so it isn't misleading please?

[dianacarvalho1]

we could make this nicer like

let balance_manager_address = config
    .get("balance_manager_address")
    .ok_or_else(|| EncodingError::FatalError(
        "Missing liquorice balance manager address in config".to_string(),
    ))
    .and_then(|s| {
        Bytes::from_str(s).map_err(|_| {
            EncodingError::FatalError(
                "Invalid liquorice balance manager address".to_string(),
            )
        })
    })?;