Macro zkp_u256::assign_ops_from_trait

macro_rules! assign_ops_from_trait {
    (
        $type:ident,
        $rhs:ident,
        $op_trait:ident,
        $op_fn:ident,
        $trait:ident,
        $trait_assign_fn:ident
    ) => { ... };
}

Implement assignment operator using OpInline trait.