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/handlers/ParamsFunction.kt

@@ -0,0 +1,8 @@
+package somefortest
+
+fun test(a: Int) {
+}
+
+fun other() {
+    te<caret>
+}