Proposal: Add SliceToSet, WithoutBy

[senago]

It's pretty often that one needs to exclude some entries from slice by some keys

There's lo.Without which could be useful
But it's not always convenient cause it could be so that you have an entity and only its' keys
In that case it could be useful to have

SliceToSet[K comparable](values []K) map[K]struct{}

For example:

type Entity struct {
	Key string
	Value string
}

func filter(entities []Entity) []Entity {
	blackList := SliceToSet(getBlackList()) // map[string]struct{}

	return lo.Filter(entities, func(e Entity, _ int) bool {
		_, ok := blackList[e.Key]
		return !ok
	})
}

Yeah, one could simply return the map from getBlackList() or use lo.Contains
But to return that map SliceToSet could still be useful and lo.Contains is not always optimal
And I guess there's lots of other applications of such a function

Also seems like it could be useful adding

WithoutBy[T any, K comparable](collection []T, extract func(T) K, exclude ...K) []T

[samber]

Both proposals seem good to me.

I first hesitated to name SliceToSet() just Set(), but your suggestion might be more accurate.

Please open 2 PRs for these helpers.