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/weighers/basic/ExactMatchForKeyword.kt

@@ -0,0 +1,10 @@
+fun test() {
+    val ifMore = true
+    val isFirst = true
+    if<caret>
+}
+
+// ORDER: if
+// ORDER: ifMore
+// ORDER: isFirst
+// SELECTED: 0