Improve formatting of field with generics

[belav]

public static Dictionary<Type,
    string[]> PropertiesByType = new Dictionary<Type, string[]>();
// should be
public static Dictionary<Type, string[]> PropertiesByType =
    new Dictionary<Type, string[]>();

There are probably also some edge cases around generics that aren't handled yet, because this feels like a weird way to break if it were too long by itself

public static Dictionary<Type,
    string[]>

[shocklateboy92]

Welll, it looks like prettier does this:

function withTypeArgs<
    LooooooongArgument1,
    LooooooooongArgument2,
    LooooooongArgument3
  >(
    someLongVarForTheHellOfIt: LooooooongArgument1<
      WithSubArg1<WithSubSubArg1, AndSubArg2>,
      AndSubArg2
    >
  ) {}

Which (I think) we can replicate pretty easily by using PrintArgumentListLikeSyntax().

[belav]

Possibly related

        private static readonly Func<SyntaxTrivia,
            bool> s_isVisualBasicCommentTrivia = (
            syntaxTrivia
        ) => syntaxTrivia.IsKind(VisualBasic.SyntaxKind.CommentTrivia)

[belav]

I broke off the Func<> example to #236
Trying to get the more basic cases formatting well is causing a bunch of existing formatting to change, so this isn't as easy as I originally hoped.