Suggest breaking down conjunctions in list comprehensions

I had an instance where I would have liked to see this:

    simpleCases :: (Int, Int) -> [Int]
    simpleCases (x, y) = [x | y >= x && p x]

being rewritten to this:

    simpleCases :: (Int, Int) -> [Int]
    simpleCases (x, y) = [x | y >= x, p x]

One way to probably achieve this in a special case like above (with just that one conjunction present) would have been:

    - hint: {lhs: "[x | y && z]", rhs: "[x | y, z]", name: Break down conjunction in list comprehension}

But Neil rightfully said (https://github.com/ndmitchell/hlint/pull/668#issuecomment-501168192) that this should also be made to work in cases like [x | a <- foo, b && c] etc., and that to that would require changes around https://github.com/ndmitchell/hlint/blob/master/src/Hint/List.hs#L58 in source.

Start at src/Hint/List.hs around line 58 and inspect how list-comprehension hints handle guards and qualifiers. Support conjunctions in guards alongside qualifiers such as [a <- foo, b && c], and verify that the suggested rewrite covers the examples in the issue without changing unrelated cases.