slices: add ChunkBy

[TonyDMorris]

adds ChunkBy which accepts a slice and chunks the slice into segments of size <= given integer value

I find myself writing this function every time I start a new project as its necessary for batching api calls or distributing work to worker groups.

func ChunkBy[T any](s []T, n int) (chunks [][]T)

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Patch Set 1: Hold+1

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Message from Ian Lance Taylor:

Patch Set 1: Hold+1

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