New J2K: add copy-paste tests for new j2k

nj2k/testData/copyPaste/SampleBlock.expected.kt

@@ -0,0 +1,12 @@
+fun main(args: Array<String>) {
+    val buffer: List<PsiElement> = getSelectedElements(code.getFile(), code.getStartOffsets(), code.getEndOffsets())
+
+    val project: Project = file.getProject()
+    val converter = Converter(project, J2kPackage.getPluginSettings())
+    val result = StringBuilder()
+    for (e in buffer) {
+        result.append(converter.elementToKotlin(e))
+    }
+
+    return StringUtil.convertLineSeparators(result.toString())
+}