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/injava/mockLib/main.kt

@@ -0,0 +1,51 @@
+package mockLib.foo
+
+public class LibClass {
+    public fun foo() {
+    }
+
+    companion object {
+        fun classObjectFun() {
+        }
+
+        public object NestedObject
+    }
+
+    public class Nested {
+        public val valInNested: Int = 1
+        public fun funInNested() {
+        }
+    }
+
+    public val nested: Nested = Nested()
+}
+
+public trait LibTrait {
+    public fun foo() {
+    }
+}
+
+public enum class LibEnum {
+    RED
+    GREEN
+    BLUE
+}
+
+public object LibObject
+
+public fun topLevelFunction(): String = ""
+
+public fun String.topLevelExtFunction(): String = ""
+
+public var topLevelVar: String = ""
+
+class F() {
+    companion object {
+        class F {
+            companion object {
+                object F {
+                }
+            }
+        }
+    }
+}