chore: add all pause constant

[stevieraykatz]

uint8 with all four bits set == 15

        uint8 ALL_PAUSED = uint8(
            (1 << uint8(IB20.PausableFeature.TRANSFER)) | (1 << uint8(IB20.PausableFeature.MINT))
                | (1 << uint8(IB20.PausableFeature.BURN)) | (1 << uint8(IB20.PausableFeature.REDEEM))
        );