ExtensionArray/Index/Series.repeat signature

[TomAugspurger]

In #24395 @jschendel mentioned that

I think this could be restricted to repeat(self, repeats, axis=None) but I opted to match on the least restrictive function signature instead.

I agree and I think we should do that.

[jreback]

agree here as well.

[jschendel]

Sounds good. Worth noting that this is would be identical to the signature for numpy.repeat, which makes sense to match. Was a little confused as to why we were using *args and **kwargs, but went with it since it was the existing convention. Can get to this in the next couple days.