Fixes to autofmt, make it more aggressive (#2230)

* fix: fmt unterminated if, be more aggressive with line splits

* Fix: Handle long exprs in for/if statements

packages/autofmt/tests/samples/collapse_expr.rsx

@@ -1,4 +1,7 @@
 fn itworks() {
-    rsx!( "{name}", "{name}", "{name}" )
+    rsx! {
+        "{name}"
+        "{name}"
+        "{name}"
+    }
 }
-