btrfs: tree-checker: add extra ram_bytes and disk_num_bytes check

This is to ensure non-compressed file extents (both regular and
prealloc) should have matching ram_bytes and disk_num_bytes.

This is only for CONFIG_BTRFS_DEBUG and CONFIG_BTRFS_ASSERT case,
furthermore this will not return error, but just a kernel warning to
inform developers.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>