Kapt: Add tests with Filer.

JavaFileObject.getName() now returns a path as required.
(cherry picked from commit c611f9b)

plugins/annotation-processing/testData/withFiler/MethodsFields.kt

@@ -0,0 +1,9 @@
+annotation class Inject
+
+class Test {
+    @Inject
+    fun myFunc(): String = "Mary"
+
+    @field:Inject
+    val myField: String = "Tom"
+}