Bite 208. Find the number pairs summing up N

In this Bite you complete find_number_pairs which receives a list of numbers and returns all the pairs that sum up to N (default=10). Return this list of tuples from the function.

So in the most basic example if we pass in [2, 3, 5, 4, 6] it returns [(4, 6)] and if we give it [9, 1, 3, 8, 7] it returns [(9, 1), (3, 7)]. The tests check more scenarios (floats, other values of N, negative numbers).

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