Solve a problem similar to finding the minimum eating speed, using binary search on the answer.
Given an array piles, where each value is a workload, and an integer h, return the smallest integer processing speed that completes all workloads within h hours. Each hour processes at most speed units from one workload, and work cannot be shared between workloads during an hour.
Implement def min_eating_speed(piles, h):, returning an integer.
def min_eating_speed(piles, h):