test/function/parameter.unit

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### Most tests of parameter list formatting are handled by type/function.stmt.
>>> Old style function typed parameter.
bool doStuff(parameter1, void callback(int i, bool b)) {}
<<<
bool doStuff(
  parameter1,
  void callback(int i, bool b),
) {}
>>> Split inside old style function typed parameter.
bool doStuff(parameter1,
void callback(LongTypeName parameter1, AnotherLongType parameter2)) {}
<<<
bool doStuff(
  parameter1,
  void callback(
    LongTypeName parameter1,
    AnotherLongType parameter2,
  ),
) {}
>>> Generic old style function typed parameter.
function(int   foo  <  T  ,S >(T t, S s)) {}
<<<
function(int foo<T, S>(T t, S s)) {}
>>> Nullable old style function typed parameter.
function(int? callback()    ?  ) {}
<<<
function(int? callback()?) {}
>>> `var` and `final` keywords on parameters.
function(var x, final y, final String z) {}
<<<
function(
  var x,
  final y,
  final String z,
) {}
>>> Required old style function typed parameter.
f({   required    callback()}) {}
<<<
f({required callback()}) {}