feat: adds ability to copy data from across locales (#8203)

### What?

Adds ability to copy data from one locale to another at a document
level.

### How?

For any localized collection, you will find a new option in the document
controls called `Copy to Locale`.

This option will open a drawer, from here you can select your origin and
destination locales.

If data already exists in the destination locale, you can choose to: 
1. Overwrite this data (this will copy any empty fields in your origin
locale)
2. Not overwrite existing data (this will only copy data into empty
fields in the destination locale)

---------

Co-authored-by: Jarrod Flesch <jarrodmflesch@gmail.com>

test/localization/collections/NestedToArrayAndBlock/index.ts

@@ -31,5 +31,21 @@ export const NestedToArrayAndBlock: CollectionConfig = {
         },
       ],
     },
+    {
+      name: 'topLevelArray',
+      type: 'array',
+      localized: false,
+      fields: [
+        {
+          name: 'localizedText',
+          type: 'text',
+          localized: true,
+        },
+        {
+          name: 'notLocalizedText',
+          type: 'text',
+        },
+      ],
+    },
   ],
 }