Skip conversion step for operations like isEmpty

[jfmengels]

✅ #303
Dict.fromList >> Dict.isEmpty
--> List.isEmpty

✅ #303
Set.fromList >> Set.isEmpty
--> List.isEmpty

✅ #293
Dict.toList >> List.isEmpty
--> Dict.isEmpty

✅ #293
Set.toList >> List.isEmpty
--> Set.isEmpty

✅ #293
Dict.toList >> List.length
--> Dict.size

✅ #293
Set.toList >> List.length
--> Set.size

-- Note: This one doesn't work
Dict.fromList >> Dict.size
--> List.length

I'm sure we can find more operations like this for Dict/Set/List. And maybe there are similar things we can do for Maybe/Result.

[morteako]

@jfmengels Some of these got implemented in : https://github.com/jfmengels/elm-review-simplify/pull/293

The two missing (not including the one that doesn't work 😅 )

Dict.fromList >> Dict.isEmpty
--> List.isEmpty

Set.fromList >> Set.isEmpty
--> List.isEmpty

[jfmengels]

Implemented in #293 and #303.