Fibonacci Sequence

by windliang @wind-liang

` that takes a number `T` and returns its corresponding [Fibonacci number](https://en.wikipedia.org/wiki/Fibonacci_number). The sequence starts: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ... For example ```ts type Result1 = Fibonacci<3> // 2 type Result2 = Fibonacci<8> // 21 ```