Write a function that takes in a string and for each character, returns the distance to the nearest vowel in the string. If the character is a vowel itself, return 0.
distance_to_nearest_vowel("aaaaa") ➞ [0, 0, 0, 0, 0]
distance_to_nearest_vowel("babbb") ➞ [1, 0, 1, 2, 3]
distance_to_nearest_vowel("abcdabcd") ➞ [0, 1, 2, 1, 0, 1, 2, 3]
distance_to_nearest_vowel("shopper") ➞ [2, 1, 0, 1, 1, 0, 1]