implemented multiclass for svc

[DanielLacina]

No description provided.

[DanielLacina]

I messed up. My .git directory got corrupted and then I deleted it. Then I initialized a new .git folder and forced push the code but that erased the commit history. Im sorry about that.

[DanielLacina]

impl<'a, TX: Number + RealNumber, TY: Number + Ord, X: Array2<TX>, Y: Array1<TY>>
    SupervisedEstimatorBorrow<'a, X, Y, SVCParameters<TX, TY, X, Y>> for SVC<'a, TX, TY, X, Y>
{
    fn new() -> Self {
        Self {
            classes: Option::None,
            instances: Option::None,
            parameters: Option::None,
            w: Option::None,
            b: Option::None,
            phantomdata: PhantomData,
        }
    }
    fn fit(
        x: &'a X,
        y: &'a Y,
        parameters: &'a SVCParameters<TX, TY, X, Y>,
    ) -> Result<Self, Failed> {
        SVC::fit(x, y, parameters)
    }
}```

[DanielLacina]

Isnt this the API?

[DanielLacina]

Anyways Ill fix it.

[DanielLacina]

PR is ready for review.

[Mec-iS]

Good! all checks passed.

ok, this is better but you didn't need to open a new PR, see also -> #306 (comment)

This PR's code is closer to what I had in mind just: when you add a method to an existing interface, like multiclass_fit, it goes at the end of the list (not at the beginning) to not break the reading convention. Same for the tests, you don't add the top but at the bottom. I know this sounds like nitpicking but it is good code hygiene.

[DanielLacina]

alright Ill change it accordingly

[DanielLacina]

@Mec-iS fixed

[Mec-iS]

Good one 🚀 I will merge it when the checks have finished. It will be released with v0.4.2

[Mec-iS]

Thanks!