v3 PalletInfo had the fields public, but not v4. Any reason why?
I need the PalletInfo fields public so I can read the values and do some
logic based on that at Polimec
@franciscoaguirre 

If this could be backported would be highly appreciated 



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Co-authored-by: Adrian Catangiu <adrian@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>