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/basic/multifile/NotImportedExtensionProperty/NotImportedExtensionProperty.dependency.kt

@@ -0,0 +1,6 @@
+package abc
+
+val String.helloProp1: Int get() = 1
+val String.helloProp2: Int get() = 2
+val Int.helloProp3: Int get() = 3
+val helloProp4: Int = 4

idea/idea-completion/testData/basic/multifile/NotImportedExtensionProperty/NotImportedExtensionProperty.kt

@@ -0,0 +1,12 @@
+package first
+
+fun firstFun() {
+    val a = ""
+    a.hello<caret>
+}
+
+// EXIST: { lookupString: "helloProp1", attributes: "bold" }
+// EXIST: { lookupString: "helloProp2", attributes: "bold" }
+// ABSENT: helloProp3
+// ABSENT: helloProp4
+// NUMBER: 2