NumberPropType doesn't work with Markup values.

Problem/Motivation

When I use "[Field item] Decimal value" for the components prop type "number" I'm getting:

Warning: Object of class Drupal\Core\Render\Markup could not be converted to float in Drupal\ui_patterns\Plugin\UiPatterns\PropType\NumberPropType::normalize() (line 60 of modules/contrib/ui_patterns/src/Plugin/UiPatterns/PropType/NumberPropType.php).

which results displaying incorrect value === 1.

Steps to reproduce

1. Create component with prop type number. i.e
   

   props:
     type: object
       price:
         type: number
         title: Price
   

2. In content's "Manage display" Ui patterns formatter pass field type "decimal" to the prop type number using "[Field item] Decimal value" and save.
3. Warning is displayed with incorrect value (1)

Proposed resolution

In \Drupal\ui_patterns\Plugin\UiPatterns\PropType\NumberPropType::normalize
add this condition to cover MarkupInterface value's type

    use Drupal\Component\Render\MarkupInterface;
    ...
    if ($value instanceof MarkupInterface) {
      $value = $value->__toString();
    }

Remaining tasks

n/a

User interface changes

n/a

API changes

n/a

Data model changes

n/a