Kernel: Load USTAR from a boot module if loading root partition fails

This allows banan-os to boot on hardware where we don't have working
storage driver or the storage driver fails (pretty common with my usb
mass storage drivers...)

kernel/include/kernel/FS/USTARModule.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <kernel/BootInfo.h>
+#include <kernel/FS/FileSystem.h>
+
+namespace Kernel
+{
+
+	bool is_ustar_boot_module(const BootModule&);
+	BAN::ErrorOr<void> unpack_boot_module_into_filesystem(BAN::RefPtr<FileSystem>, const BootModule&);
+
+}