add time-limit for univariate optimizers

[davidschlegel]

Currently, Brent's method and GoldenSection only support a maximum number of iteration as a finite stopping criterium.
Currently, the signature of both these methods are:

function optimize(
        f, x_lower::T, x_upper::T,
        mo::Function;
        rel_tol::T = sqrt(eps(T)),
        abs_tol::T = eps(T),
        iterations::Integer = 1_000,
        store_trace::Bool = false,
        show_trace::Bool = false,
        callback = nothing,
        show_every = 1,
        extended_trace::Bool = false) where T <: AbstractFloat

It would be very important to add also a time limit.

[pkofod]

That would be consistent with multivariate optimizaiton, yes.

[christianhauschel]

I'd love to have this too

[pkofod]

Would you be up to try to implement it? I don't think it should be that hard. You can just mimic it for multivariate.