Add pair_op_1 and pair_op_2
The two new lemmas allow splitting the resources in one component of a pair when the other component has nothing. In combination with `pair_split`, they allow to arbitrarily split the resource `(a ⋅ a', b ⋅ b')`. This is in line with `prod_local_update_1` and `prod_local_update_2`, the lemmas that allow, in a sense, to only consider one component of a pair.
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