[Data Liberation] wp-admin importer page (#2003)

## Motivation for the change, related issues

A rough mockup of a wp-admin page for data liberation imports:

![CleanShot 2024-11-18 at 19 23
52@2x](https://github.com/user-attachments/assets/0b0990cb-d4f8-476b-8df4-78475816b5fc)

It actually allows you to import a WXR file, but almost nothing else
works. This PR is only meant to provide a starting point to expand.

## Testing Instructions (or ideally a Blueprint)

* Run Playground with the data-liberation plugin installed:

```bash
cd packages/playground/data-liberation/tests/import
bash run.sh
```

* Go to http://127.0.0.1:9400/wp-admin/admin.php?page=data-liberation
* Confirm you can see the screen from the picture above

cc @brandonpayton @zaerl

packages/php-wasm/compile/php/Dockerfile

@@ -815,7 +815,9 @@ export ASYNCIFY_ONLY=$'"rc_dtor_func",\
 "stream_resource_regular_dtor",\
 "stream_array_from_fd_set",\
 "zend_call_function",\
+"zend_call_method_if_exists",\
 "zend_call_known_function",\
+"php_userstreamop_set_option",\
 "zend_close_rsrc_list",\
 "zend_deactivate",\
 "zend_destroy_rsrc_list",\
@@ -826,6 +828,7 @@ export ASYNCIFY_ONLY=$'"rc_dtor_func",\
 "zend_execute",\
 "zend_execute_scripts",\
 "zend_error",\
+"zend_deprecated_function",\
 "zend_error_va_list",\
 "zend_hash_apply",\
 "zend_hash_graceful_reverse_destroy",\
@@ -842,6 +845,7 @@ export ASYNCIFY_ONLY=$'"rc_dtor_func",\
 "zif_call_user_func",\
 "zif_json_encode",\
 "zif_call_user_func_array",\
+"zend_user_it_get_current_data",\
 "zif_fclose",\
 "zif_feof",\
 "zif_file_get_contents",\

packages/playground/data-liberation/import-screen.js

@@ -0,0 +1,14 @@
+import { store, getContext } from '@wordpress/interactivity';
+const { state } = store('dataLiberation', {
+	state: {
+		selectedImportType: 'wxr_file',
+		get isImportTypeSelected() {
+			return getContext().importType === state.selectedImportType;
+		},
+	},
+	actions: {
+		setImportType: () => {
+			state.selectedImportType = getContext().importType;
+		},
+	},
+});