feature #31975 Dynamic bundle assets (garak)

This PR was squashed before being merged into the 4.4 branch (closes #31975).

Discussion
----------

Dynamic bundle assets

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no (new method in interface as annotation)
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #29213
| License       | MIT
| Doc PR        | none (yet)

Everything is explained in linked issue

Commits
-------

c16fcc93e2 Dynamic bundle assets

src/Symfony/Bundle/FrameworkBundle/Command/AssetsInstallCommand.php

@@ -137,7 +137,13 @@ EOT
         $validAssetDirs = [];
         /** @var BundleInterface $bundle */
         foreach ($kernel->getBundles() as $bundle) {
-            if (!is_dir($originDir = $bundle->getPath().'/Resources/public')) {
+            if (!method_exists($bundle, 'getPublicPath')) {
+                @trigger_error('Not defining "getPublicPath()" method is deprecated since Symfony 4.4 and will not be supported in 5.0.', E_USER_DEPRECATED);
+                $publicPath = 'Resources/public';
+            } else {
+                $publicPath = $bundle->getPublicPath();
+            }
+            if (!is_dir($originDir = $bundle->getPath().\DIRECTORY_SEPARATOR.$publicPath)) {
                 continue;
             }
 

src/Symfony/Component/HttpKernel/Bundle/Bundle.php

@@ -135,6 +135,11 @@ abstract class Bundle implements BundleInterface
     {
     }
 
+    public function getPublicPath(): string
+    {
+        return 'Resources/public';
+    }
+
     /**
      * Returns the bundle's container extension class.
      *

src/Symfony/Component/HttpKernel/Bundle/BundleInterface.php

@@ -19,6 +19,8 @@ use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
  * BundleInterface.
  *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @method string getPublicPath() Returns relative path for public assets
  */
 interface BundleInterface extends ContainerAwareInterface
 {

src/Symfony/Component/HttpKernel/Tests/KernelTest.php

@@ -627,7 +627,7 @@ EOF;
     {
         $bundle = $this
             ->getMockBuilder('Symfony\Component\HttpKernel\Bundle\BundleInterface')
-            ->setMethods(['getPath', 'getParent', 'getName'])
+            ->setMethods(['getPath', 'getPublicPath', 'getParent', 'getName'])
             ->disableOriginalConstructor()
         ;
 
@@ -649,6 +649,12 @@ EOF;
             ->willReturn($dir)
         ;
 
+        $bundle
+            ->expects($this->any())
+            ->method('getPublicPath')
+            ->willReturn('Resources/public')
+        ;
+
         $bundle
             ->expects($this->any())
             ->method('getParent')