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/NotImportedFunction/NotImportedFunction.dependency.kt

@@ -0,0 +1,8 @@
+package test
+
+fun globalFun1(): Int = 1
+fun globalFun2(): Int = 1
+
+object Some {
+    fun globalFun3(): Int = 3
+}

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

@@ -0,0 +1,8 @@
+package pack
+
+fun testFun() {
+    gl<caret>
+}
+
+// EXIST: globalFun1, globalFun2
+// ABSENT: globalFun3