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/heuristicSignatures/Remove.kt

@@ -0,0 +1,9 @@
+import java.util.*
+
+fun foo(list: ArrayList<String>, p1: Any, p2: String) {
+    list.remove(<caret>)
+}
+
+// ABSENT: p1
+// EXIST: p2
+// EXIST: { itemText: "String", tailText: "() (kotlin)" }