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/common/StandardJetDoubleFirst.kt

@@ -0,0 +1,8 @@
+fun some(a: Double<caret>) {
+}
+
+// INVOCATION_COUNT: 2
+// WITH_ORDER: true
+// EXIST: { lookupString:"Double", tailText:" (kotlin)" }
+// EXIST_JAVA_ONLY: { lookupString:"Double", tailText:" (java.lang)" }
+// EXIST: { lookupString:"DoubleArray", tailText:" (kotlin)" }