Created module idea-test-framework and moved classes needed for idea tests there

Moved tests for completion and their test data into module idea-completion

idea/idea-completion/testData/smart/whenEntry/WhenWithNoSubject1.kt

@@ -0,0 +1,11 @@
+fun foo(b1: Boolean, b2: Boolean) {
+    when {
+        <caret>
+    }
+}
+
+// EXIST: b1
+// EXIST: b2
+// ABSENT: true
+// ABSENT: false
+// ABSENT: else