3.0 FormHelper pass arbitrary data to stringTemplates?

It would be nice to pass-through arbitrary values to the stringTemplates in form helper.

```

$this->Form->templates(['inputContainer' => '<div class="{{outclass}}">{{content}}</div>']);

```

I think this could be done through the options passed to the helper method.

```php

$this->Form->input('field', ['templateVars' => ['outclass' => 'col-1-2']]);

```

I can work on the PR if this seems like a good approach. I am mostly interested in this for being able to set the class of the inputContainer div, but it does seem like there could be other reasons this would be useful.

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