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/BeforeArgumentWithBinaryOperation2.kt

@@ -0,0 +1,10 @@
+val v1: Int = 10
+val v2: String = ""
+
+fun foo(i: Int){}
+
+var call: A = foo(<caret>3 + 2)
+    set(value) {  }
+
+// EXIST: v1
+// ABSENT: v2