Correct descriptor shape for @JvmRecord annotated classes

This commit adds relevant functions: hashCode, toString, equals
(if the class is not a data class)
And supertype j.l.Record

It only affects descriptor contents, i.e. works for FE

^KT-43677 In Progress

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsWithJdk15TestGenerated.java

@@ -50,6 +50,11 @@ public class DiagnosticsWithJdk15TestGenerated extends AbstractDiagnosticsWithJd
             runTest("compiler/testData/diagnostics/testsWithJava15/jvmRecord/disabledFeature.kt");
         }
 
+        @TestMetadata("jvmRecordDescriptorStructure.kt")
+        public void testJvmRecordDescriptorStructure() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithJava15/jvmRecord/jvmRecordDescriptorStructure.kt");
+        }
+
         @TestMetadata("simpleRecords.kt")
         public void testSimpleRecords() throws Exception {
             runTest("compiler/testData/diagnostics/testsWithJava15/jvmRecord/simpleRecords.kt");