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/NotImportedExtensionFunctionAndAlias/NotImportedExtensionFunctionAndAlias.dependency1.kt

@@ -0,0 +1,9 @@
+package second
+
+import third.Dependency as MyDependency
+
+fun MyDependency?.helloFun() {
+}
+
+fun <T: MyDependency> T.helloFunGeneric() {
+}

idea/idea-completion/testData/basic/multifile/NotImportedExtensionFunctionAndAlias/NotImportedExtensionFunctionAndAlias.dependency2.kt

@@ -0,0 +1,3 @@
+package third
+
+class Dependency

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

@@ -0,0 +1,9 @@
+package first
+
+fun firstFun(x: third.Dependency) {
+    x.hello<caret>
+}
+
+// EXIST: helloFun
+// EXIST: helloFunGeneric
+// NUMBER: 2