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/NotImportedExtensionFunction/NotImportedExtensionFunction.dependency.kt

@@ -0,0 +1,17 @@
+package second
+
+fun String?.helloFun() {
+}
+
+fun String.helloWithParams(i : Int) : String {
+    return ""
+}
+
+fun <T: CharSequence> T.helloFunGeneric() {
+}
+
+fun Int.helloFake() {
+}
+
+fun dynamic.helloDynamic() {
+}

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

@@ -0,0 +1,12 @@
+package first
+
+fun firstFun() {
+    val a = ""
+    a.<caret>
+}
+
+// EXIST: helloFun
+// EXIST: helloWithParams
+// EXIST: helloFunGeneric
+// EXIST: helloDynamic
+// ABSENT: helloFake