Add a name to the Composite\Fieldset\Options block directive

Add the name "product.composite.fieldset.options" to Composite\Fieldset\Options block so that third party custom options can add their own values without re-declaring the product.composite.fieldset directive.

Author: navarr

app/code/Magento/Catalog/view/adminhtml/layout/CATALOG_PRODUCT_COMPOSITE_CONFIGURE.xml

@@ -8,7 +8,7 @@
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/layout_generic.xsd">
     <container name="root">
         <block class="Magento\Catalog\Block\Adminhtml\Product\Composite\Fieldset" name="product.composite.fieldset">
-            <block class="Magento\Catalog\Block\Adminhtml\Product\Composite\Fieldset\Options" template="Magento_Catalog::catalog/product/composite/fieldset/options.phtml">
+            <block class="Magento\Catalog\Block\Adminhtml\Product\Composite\Fieldset\Options" name="product.composite.fieldset.options" template="Magento_Catalog::catalog/product/composite/fieldset/options.phtml">
                 <block class="Magento\Catalog\Block\Product\View\Options\Type\DefaultType" as="default" template="Magento_Catalog::catalog/product/composite/fieldset/options/type/default.phtml"/>
                 <block class="Magento\Catalog\Block\Product\View\Options\Type\Text" as="text" template="Magento_Catalog::catalog/product/composite/fieldset/options/type/text.phtml"/>
                 <block class="Magento\Catalog\Block\Product\View\Options\Type\File" as="file" template="Magento_Catalog::catalog/product/composite/fieldset/options/type/file.phtml"/>