Allow extending of page edit record forms (#1938)

This PR adds the ability to extend base edit record pages.

Our use case is the ability to add to the inventory pages, which is why
I've applied this to them.

---------

Co-authored-by: Author <[email protected]>

packages/admin/src/Filament/Resources/ProductResource/Pages/ManageProductInventory.php

@@ -92,7 +92,7 @@ protected function getFormActions(): array
         ];
     }
 
-    public function form(Form $form): Form
+    public function getDefaultForm(Form $form): Form
     {
         return (new ManageVariantInventory)->form($form)->statePath('');
     }

packages/admin/src/Filament/Resources/ProductVariantResource/Pages/ManageVariantInventory.php

@@ -61,7 +61,7 @@ protected function getDefaultHeaderActions(): array
         ];
     }
 
-    public function form(Form $form): Form
+    public function getDefaultForm(Form $form): Form
     {
         return $form->schema([
             Section::make()->schema([

packages/admin/src/Support/Pages/BaseCreateRecord.php

@@ -9,6 +9,7 @@ abstract class BaseCreateRecord extends CreateRecord
 {
     use Concerns\ExtendsFooterWidgets;
     use Concerns\ExtendsFormActions;
+    use Concerns\ExtendsForms;
     use Concerns\ExtendsHeaderActions;
     use Concerns\ExtendsHeaderWidgets;
     use Concerns\ExtendsHeadings;

packages/admin/src/Support/Pages/BaseEditRecord.php

@@ -9,6 +9,7 @@ abstract class BaseEditRecord extends EditRecord
 {
     use Concerns\ExtendsFooterWidgets;
     use Concerns\ExtendsFormActions;
+    use Concerns\ExtendsForms;
     use Concerns\ExtendsHeaderActions;
     use Concerns\ExtendsHeaderWidgets;
     use Concerns\ExtendsHeadings;

packages/admin/src/Support/Pages/Concerns/ExtendsForms.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Lunar\Admin\Support\Pages\Concerns;
+
+use Filament\Forms\Form;
+
+trait ExtendsForms
+{
+    public function form(Form $form): Form
+    {
+        return self::callLunarHook('extendForm', $this->getDefaultForm($form));
+    }
+
+    public function getDefaultForm(Form $form): Form
+    {
+        return $form;
+    }
+}