New J2K: add multi-file conversion tests from old j2k

nj2k/testData/multiFile/ToCompanionObject/ClassWithStatics.kt

@@ -0,0 +1,15 @@
+package test
+
+internal open class ClassWithStatics {
+    fun instanceMethod() {}
+
+    companion object {
+        @JvmStatic
+        fun staticMethod(p: Int) {}
+        const val staticField = 1
+        @JvmField
+        var staticNonFinalField = 1
+        var value = 0
+
+    }
+}