Code completion updates for enhanced switches (IDEA-202340)

- Support inside switch expression
- Support rule-based labels
- Support break inside expression
- Suggest 'switch' keyword in expressions
- Insert ':' or '->' depending on the switch type

java/java-tests/testData/codeInsight/completion/normal/DefaultInRuleSwitch.java

@@ -0,0 +1,9 @@
+public class ConstConfig {
+    {
+        switch (a) {
+            case Foooo -> {}
+            def<caret>
+
+        }
+    }
+}