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kotlinlang

I've encountered a case where I need assertions like this:
```listOf(1, 2, 3, 2).shouldContainTimes(element = 2, times = 2)```
do we want to add it to kotest? if yes, how should we name it?

wonder if we want to accept a list of elements rather than a single one?

yeah, but if you are going to build it :slightly_smiling_face: and if it is going to be an assertion on collections only, might as well make it reusable - that being said, we can always iterate if there is need, so single el sounds good too

I kinda already built it. All we need is to share it out

shouldContainDuplicates or should ContainRepeats?

we already have `shouldContainDuplicates` but I like `shouldContainRepeats`

actually I'm thinking of `shouldContainExactCount` as we can require `count=1` which is not repeats