Introduce internal class wrapping SplFileInfo

[sivaschenko]

• Introduce Magento\MediaGallerySynchronization\Model\Filesystem\FileInfo class wrapping the PHP native \SplFileInfo class providing access to all it's getters
• Replace Magento\MediaGallerySynchronization\Model\Filesystem\SplFileInfoFactory with Magento\MediaGallerySynchronization\Model\Filesystem\GetFileInfo:execute(string $path): FileInfo service
• SplFileInfoFactory::execute should accept $path to file as a parameter, create SplFileInfo based on the path and extract the data from SplFileInfo to populate the FileInfo instance.

[m2-assistant]

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