HowTo: enable SFTP for Flysystem

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Flysystem does not support SFTP by default, but the separate Flysystem Adapter for SFTP module enables it.

To enable SFTP for Flysystem, implement FlysystemFilesystemBuilderPluginInterface and add it to \Pyz\Service\Flysystem\FlysystemDependencyProvider::addFilesystemBuilderPluginCollection.