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[FEATURE] Introduce `slot.has` view helper (#53)

This is a conditional view helper, used to check if a slot has been
defined in a field template. It allows changing the HTML rendering
depending on the presence of the slot.

**Example:**

```
<div class="container">
    <formz:slot.has slot="Image">
        <div class="image">
            <formz:slot.render slot="Image" />
        </div>
    </formz:slot.has>
</div>
```

`<f:then>` and `<f:else>` work too!

```
<div class="container">
    <formz:slot.has slot="Image">
        <f:then>
            <formz:slot.render slot="Image" />
        </f:then>
        <f:else>
            <img src="default-image.jpg" />
        </f:else>
    </formz:slot.has>
</div>
```

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