MaxNumber returns the maximum value from a list of numbers.
The function takes a variadic parameter of type V, which can be int32, int64, float32, or float64.
It returns the maximum value found and an error if the list is empty.
MinNumber finds and returns the minimum number from a variadic list of numbers.
It takes in one or more numbers of type int32, int64, float32, or float64.
It returns the minimum number found from the given list of numbers and an error.