- added `Symfony\Component\Cache\PruneableInterface` so PSR-6 or PSR-16 cache implementations can declare support
for manual stale cache pruning
- added FilesystemTrait::prune() and PhpFilesTrait::prune() implementations
- now FilesystemAdapter, PhpFilesAdapter, FilesystemCache, and PhpFilesCache implement PruneableInterface and
supports manual stale cache pruning
- Added `cache:pool:prune` command via `Symfony\Bundle\FrameworkBundle\Command\CachePoolPruneCommand` to allow
manual stale cache item pruning of supported PSR-6 and PSR-16 cache pool implementations
- Added `Symfony\Bundle\FrameworkBundle\DependencyInjection\Compiler\CachePoolPrunerPass` compiler pass to fetch
all cache pools implementing `PruneableInterface` and pass them to the command as an `IteratorArgument` so
these references are lazy loaded by the command
- updated changelogs as appropriate
