feature symfony#57073 [AssetMapper][FrameworkBundle] Do not require http_client service (ruudk)

This PR was submitted for the 6.4 branch but it was merged into the 7.2 branch instead.

Discussion
----------

[AssetMapper][FrameworkBundle] Do not require `http_client` service

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  |no
| Deprecations? |no
| Issues        |
| License       | MIT

This makes it possible to use AssetMapper with `http_client` disabled on the framework.

It will automatically instantiate the required HttpClient.

Example:
```php
$configurator->extension(
    'framework',
    [
        'http_client' => [
            'enabled' => false,
        ],
        'asset_mapper' => [
            'paths' => [
                'assets/',
            ],
        ],
    ]
);
```

This fixes the following problems:
>  The service "asset_mapper.importmap.resolver" has a dependency on a non-existent service "http_client".

> The service "asset_mapper.importmap.auditor" has a dependency on a non-existent service "http_client".

>  The service "asset_mapper.importmap.update_checker" has a dependency on a non-existent service "http_client".

Commits
-------

b5e39ec Do not require `http_client` service

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Resources/config/asset_mapper.php

@@ -197,7 +197,7 @@
             ])
 
         ->set('asset_mapper.importmap.resolver', JsDelivrEsmResolver::class)
-            ->args([service('http_client')])
+            ->args([service('http_client')->nullOnInvalid()])
 
         ->set('asset_mapper.importmap.renderer', ImportMapRenderer::class)
             ->args([
@@ -212,12 +212,12 @@
         ->set('asset_mapper.importmap.auditor', ImportMapAuditor::class)
         ->args([
             service('asset_mapper.importmap.config_reader'),
-            service('http_client'),
+            service('http_client')->nullOnInvalid(),
         ])
         ->set('asset_mapper.importmap.update_checker', ImportMapUpdateChecker::class)
         ->args([
             service('asset_mapper.importmap.config_reader'),
-            service('http_client'),
+            service('http_client')->nullOnInvalid(),
         ])
 
         ->set('asset_mapper.importmap.command.require', ImportMapRequireCommand::class)

src/Symfony/Component/AssetMapper/ImportMap/ImportMapUpdateChecker.php

@@ -11,16 +11,20 @@
 
 namespace Symfony\Component\AssetMapper\ImportMap;
 
+use Symfony\Component\HttpClient\HttpClient;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
 class ImportMapUpdateChecker
 {
     private const URL_PACKAGE_METADATA = 'https://registry.npmjs.org/%s';
 
+    private readonly HttpClientInterface $httpClient;
+
     public function __construct(
         private readonly ImportMapConfigReader $importMapConfigReader,
-        private readonly HttpClientInterface $httpClient,
+        ?HttpClientInterface $httpClient = null,
     ) {
+        $this->httpClient = $httpClient ?? HttpClient::create();
     }
 
     /**