Method chaining must be fully multiline, with the first item on a new line

[mvorisek]

Feature request

extracted from #7247

expected output:

 <?php

-$foo->a()->b()->c();
+$foo
+    ->a()
+    ->b()
+    ->c();

helpful also for coverage measurements

[Wirone]

I've linked this issue in the todo list of #7247 but please don't extract other items to dedicated issues. PER-CS support doesn't need to be provided at once (rather PR per todo list item), but also atomic PRs don't need atomic issues, and can be referenced to the main one. Some todo items have issues/PRs linked because these were already created. Creating new ones will only cause more maintenance burden (stale bot) and will increase the size of the backlog.