[Analysis API] add diagnostic tests for inner Java class usage

^KT-62892

analysis/analysis-api/testData/components/diagnosticsProvider/diagnostics/javaNestedClass.kt

@@ -0,0 +1,16 @@
+// FILE: issue/pack/RowIcon.java
+package issue.pack;
+
+public class RowIcon {
+    public static class RClass {}
+}
+
+// FILE: usage.kt
+package usage
+
+fun testJavaNestedClass(alignment: issue.pack.RowIcon.RClass) {
+}
+
+fun checkIt() {
+    testJavaNestedClass(issue.pack.RowIcon.RClass())
+}