Make `FuzzUtilLimit` return random pieces of input set

[MarvinJWendt]

Make FuzzUtilLimit return random pieces of input set.

[KarolosLykos]

Hi @MarvinJWendt I was thinking of trying this one what do you think of something like that.

func FuzzUtilLimit[setType any](testSet []setType, limit int) []setType {
	seen := map[int]bool{}

	if len(testSet) <= limit {
		return testSet
	}

	if limit <= 0 {
		return []setType{}
	}

	var result []setType

	counter := 0

	for counter < limit {
		index := rand.Intn(len(testSet) - 1)
		if !seen[index] {
			seen[index] = true
			result = append(result, testSet[index])
			counter++
		}

	}

	return result
}

[MarvinJWendt]

Hi @KarolosLykos, this would definitely work, but I am not sure if the performance might be better with rand.Shuffle. We could then return a sub-slice of the shuffled slice (shuffledTestSet[:limit]). If you want to benchmark both approaches, feel free to do so, otherwise I'll do it in the next weeks and get back to you with the result :)

[KarolosLykos]

Hey @MarvinJWendt , I ran some benchmarks and rand.Shuffle is faster. Look at the benchmark tests and tell me what you think? benchmarks

I also included a PR with the proposal.

[MarvinJWendt]

Fixed in #200 and released with v0.5.2. Thanks!