Add independent implementations of Sum, with some overloads #33
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#12
Add Sum for following signatures
SumAsync(O<int>)
SumAsync<TSource>(O<int>, Func<TSource, int>)
SumAsync(O<long>)
SumAsync<TSource>(O<long>, Func<TSource, long>)
SumAsync(O<float>)
SumAsync<TSource>(O<long>, Func<TSource, long>)
SumAsync(O<double>)
SumAsync<TSource>(O<double>, Func<TSource, double>)
SumAsync(O<decimal>)
SumAsync<TSource>(O<decimal>, Func<TSource, decimal>)
SumAsync<T>(O<T>) where IAdditionOperators<T, T, T>
SumAsync<TSource, TResult>(O<TSource>, Func<TSource, TResult>) where IAdditionOperators<TResult, TResult, TResult>