Add Costar datatype
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- JavaScript
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Description
## Costar is not the same as a co-star
Want to add [this definition](https://hackage.haskell.org/package/profunctors-5.2.1/docs/Data-Profunctor.html#t:Costar) implementing:
* `Profunctor (Costar f)`
* `Costrong (Costar f)`
* no `both` like we can do with `Star` and `Arrow`
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