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/multifile/GroovyClassNameCompletionFromDefaultPackage/GroovyClassNameCompletionFromDefaultPackage.kt

@@ -0,0 +1,7 @@
+class TestKotlin
+
+val test = Test<caret>
+
+// EXIST: TestKotlin
+// EXIST: TestGroovyNormal
+// EXIST: TestGroovyScript

idea/idea-completion/testData/basic/multifile/GroovyClassNameCompletionFromDefaultPackage/normalname.groovy

@@ -0,0 +1,2 @@
+public class TestGroovyNormal {
+}

idea/idea-completion/testData/basic/multifile/GroovyClassNameCompletionFromDefaultPackage/script-file-no-classes.groovy

@@ -0,0 +1,3 @@
+def method() {
+
+}

idea/idea-completion/testData/basic/multifile/GroovyClassNameCompletionFromDefaultPackage/script-file-with-class.groovy

@@ -0,0 +1,2 @@
+public class TestGroovyScript {
+}