feature #59813 [Cache] Enable namespace-based invalidation by prefixing keys with backend-native namespace separators (nicolas-grekas)

This PR was merged into the 7.3 branch.

Discussion
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[Cache] Enable namespace-based invalidation by prefixing keys with backend-native namespace separators

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        | Fix #45599
| License       | MIT

This PR adds a `NamespacedPoolInterface` that describes how one can add namespace prefixes to cache pool keys.

This solves #45599 by allowing to use the `:` separator for Redis:
```php
$cache->withSubNamespace('some-prefix')->get($key, fn () => ...);
```

Most importantly, this enables namespace-based cache invalidation, typically with namespaces generated by hashing some context.

Commits
-------

81a8cebf0ce [Cache] Enable namespace-based invalidation by prefixing keys with backend-native namespace separators

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -214,6 +214,7 @@
 use Symfony\Component\Yaml\Yaml;
 use Symfony\Contracts\Cache\CacheInterface;
 use Symfony\Contracts\Cache\CallbackInterface;
+use Symfony\Contracts\Cache\NamespacedPoolInterface;
 use Symfony\Contracts\Cache\TagAwareCacheInterface;
 use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
@@ -2601,6 +2602,10 @@ private function registerCacheConfiguration(array $config, ContainerBuilder $con
                 $container->registerAliasForArgument($tagAwareId, TagAwareCacheInterface::class, $pool['name'] ?? $name);
                 $container->registerAliasForArgument($name, CacheInterface::class, $pool['name'] ?? $name);
                 $container->registerAliasForArgument($name, CacheItemPoolInterface::class, $pool['name'] ?? $name);
+
+                if (interface_exists(NamespacedPoolInterface::class)) {
+                    $container->registerAliasForArgument($name, NamespacedPoolInterface::class, $pool['name'] ?? $name);
+                }
             }
 
             $definition->setPublic($pool['public']);