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/LocalFileBeforeImported.kt

@@ -0,0 +1,12 @@
+import some.fooImported
+
+val fooVar = 12
+fun fooLocal() = 12
+
+val some = foo<caret>
+
+// "foo" is before other elements because of exact prefix match
+
+// ORDER: foo, fooVar, fooLocal, fooImported, fooNotImported
+// INVOCATION_COUNT: 2
+// SELECTED: 0