[Improvement] Additional setter methods

[michaelw85]

When using the ACF builder in a OOP manner setting configuration can be done using methods like so:

$builder
    ->addField('name', 'type')
        ->setLabel('Foo')
        ->setRequired()

This is nice, but not all setters are available, so you will have to use setConfig or use the array notation for some values.
While this is workable it's not ideal in my opinion.

I would like to either add methods wrapping the setConfig, which is a bit tedious but works best for intellisense, or add magic setters calling setConfig and adding docblocks for intellisense.

Before I invest any time in a PR it would be nice to receive a go-ahead or feedback if this would not be feasible.