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

Author: fabpot

Command/AssetsInstallCommand.php

@@ -137,7 +137,13 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $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;
             }