BUG: Fix np.quantile([Fraction(2,1)], 0.5) (#24711)

[charris]

Backport of #24711.

On main:

import numpy as np
from fractions import Fraction
arr = np.array([Fraction(1, 1), Fraction(2, 1), Fraction(3, 1)])
np.quantile(arr, 0) # output: Fraction(1, 1)
np.quantile(arr, Fraction(1, 2)) # output: Fraction(2, 1)
np.quantile(arr, 0.5) # raises an error

In this PR we update the np.quantile to handle the case np.quantile(arr, 0.5) as well.

Also see #24592

• BUG: Fix np.quantile([Fraction(2,1)], 0.5)

• address review comments

• pass type instead of dtype instance