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/keywords/InCodeBlock.kt

@@ -0,0 +1,24 @@
+fun foo() {
+    <caret>
+}
+
+// EXIST: class
+// EXIST: do
+// EXIST: false
+// EXIST: for
+// EXIST: fun
+// EXIST: if
+// EXIST: null
+// EXIST: object
+// EXIST: package
+// EXIST: return
+// EXIST: super
+// EXIST: throw
+// EXIST: trait
+// EXIST: true
+// EXIST: try
+// EXIST: val
+// EXIST: var
+// EXIST: when
+// EXIST: while
+// NUMBER: 19