Remove check about immediately invoked lambdas with variable name

[jfmengels]

Removed the check introduced in #124

This simplification is pretty nice, but has a few problems:

• It stands out as a simplification because it does not have an autofix (because there are multiple solutions for it, relating to code style)
• There are some edge cases where this simplification is not necessarily appropriate
  • Record updates f a |> (\v -> { v | a = 1 })
  • Extracting through destructuring f a |> (\(Thing thing) -> thing)

From feedback, people seem to think the idea is good and that it improves the readability of the code (with the exceptions that probably need some refinement), but I think it stands out too much (especially the non-fixing part) and should therefore be moved to a separate rule, probably in jfmengels/elm-review-code-style, where autofix could be supported by configuring the rule (PRs welcome 😄 )