FR: From<i64> and From<f64> for CommandOptionValue

[khionu]

As on the tin, related to #2402. I'm able to get a f64 from nom's double parser, so it would make it really nifty to get a CommandOptionValue from into(double).

impl From<i64> for CommandOptionValue {
    from(val: i64) -> Self {
        CommandOptionValue::Integer(val)
    }
}

impl From<f64> for CommandOptionValue {
    from(val: f64) -> Self {
        CommandOptionValue::Number(val)
    }
}