Gren Format command removes multiline comments, format also moves comments away from documented code

When running the gren format <file path> command:

• Single comments will be moved away from code they are directly above
• Multiline comments following the same practice as shown in the core code will be removed
• Multiline comments will be moved away from code they are directly above

Comment blocks written like:

{-| appends new line character
  Some more info I deem important
-}
appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Will be formatted to:

appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Comment blocks without the | will be moved instead of removed like so:

{- appends new line character

  Hello World
-}
appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Will be formatted to:

{- appends new line character

  Hello World
  -}


appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Single Line comments will be moved away and above code

-- appends new line character
appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Will be formatted to:

-- appends new line character


appendNewLine : String -> String
appendNewLine input =
    input ++ "\n"

Start by reproducing the issue with the gren format <file path> command using the single-line and multiline comment examples in the report. Trace the formatter entry point and add regression coverage for preserving comment text and keeping comments directly above the documented code; done means all shown examples format without removing or moving comments.