purescript-either

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Add `lefts` and `rights` functions

1

## Description of the change Add a `lefts` function similar to [the one existing in Haskell Data.Either](https://hackage.haskell.org/package/base-4.20.0.1/docs/Data-Either.html#v:lefts). Add also its "partner" `rights` function. ### Motivation I find `lefts` useful to...

l-monnier