Add getFirstWhereStartsWith() to ComponentAttributeBag

Following up on the changes from earlier today, in order to effectively use this with Livewire we need to be able to get the attribute value that starts with 'wire:model' so we can use that value for the error bag, among other reasons.

This function gives you the ability to do that. Your component would look like this:

Usage
```html
<x-text-input wire:model.lazy="name" />
```

Blade Component
```php
<div>
    <input type="text" {{$attributes->whereStartsWith('wire:model')}} />
    @error($attributes->getFirstWhereStartsWith('wire:model'))
        {{$message}}
    @enderror
</div>
```

src/Illuminate/View/ComponentAttributeBag.php

@@ -117,6 +117,30 @@ public function thatStartWith($string)
     {
         return $this->whereStartsWith($string);
     }
+
+    /**
+     * Get the first attribute that starts with the given value from the attribute array.
+     *
+     * @param  string  $string
+     * @param  mixed  $default
+     * @return mixed
+     */
+    public function getFirstWhereStartsWith($string, $default = null)
+    {
+        return $this->whereStartsWith($string)->getIterator()->current() ?? value($default);
+    }
+
+    /**
+     * Get the first attribute that starts with the given value from the attribute array.
+     *
+     * @param  string  $string
+     * @param  mixed  $default
+     * @return mixed
+     */
+    public function getFirstThatStartsWith($string, $default = null)
+    {
+        return $this->getFirstWhereStartsWith($string, $default);
+    }
 
     /**
      * Exclude the given attribute from the attribute array.