Adjust formatting of argument lists (#1260)

This changes code so that multiple lambda arguments makes the whole
argument list wrap.

Improves the readability of code like:

```
foo
  .toMap(
    (it) -> makeSomeKey(it),
    (it) -> makeSomeValue(it)
  )
```

pkl-formatter/src/test/files/FormatterSnippetTests/input/method-call-trailing-lambdas.pkl

@@ -0,0 +1,18 @@
+// multiple lambda arguments means argument list wraps
+res1 = foo.toMap(
+  (elem) -> elem.toString(),
+  (elem) -> elem.toString().split("").map((str) -> str + "hello").toSet()
+)
+
+// new object and trailing lambda means argument list wraps
+res2 = foo.doFoo(
+  new Listing { 1; 2; 3 },
+  (elem) -> elem.toString().split("").map((str) -> str + "hello").toSet()
+)
+
+// single trailing lambda is broken on its own
+res4 = foo.foldLeft(
+  "heeeeeeelloooooooooooooooooooooooooooooooooooooooooooooo",
+  (elem) -> elem.foooooooooooooooooooooooooooooooooooooooooooooooooooo
+)
+

pkl-formatter/src/test/files/FormatterSnippetTests/output/method-call-trailing-lambdas.pkl

@@ -0,0 +1,19 @@
+// multiple lambda arguments means argument list wraps
+res1 =
+  foo.toMap(
+    (elem) -> elem.toString(),
+    (elem) -> elem.toString().split("").map((str) -> str + "hello").toSet(),
+  )
+
+// new object and trailing lambda means argument list wraps
+res2 =
+  foo.doFoo(
+    new Listing { 1; 2; 3 },
+    (elem) -> elem.toString().split("").map((str) -> str + "hello").toSet(),
+  )
+
+// single trailing lambda is broken on its own
+res4 =
+  foo.foldLeft("heeeeeeelloooooooooooooooooooooooooooooooooooooooooooooo", (elem) ->
+    elem.foooooooooooooooooooooooooooooooooooooooooooooooooooo
+  )