[Java] When we complete class name after new then if constructor(s) exist: show documentation for it, for several constructors suggest list of links to particular constructor documentation, same way as we do for (overloaded) calls.

Also try hard for documentation to work on incomplete new expressions like 'new Class<caret>', 'new Class(<caret>)'. As useful side effect method documentation links are shown for overloads (or method documentation for no overloads) when documentation action is invoked in argument list.

java/java-tests/testData/codeInsight/completion/className/docAfterNew/before1.java

@@ -0,0 +1,5 @@
+public class Test1 {
+    public void foo() {
+        new Tim<caret>
+    }
+}