Add record attribute support to symbol generator CreateSymbols

When prototyping adding a new public API type, that is a record class, to the JDK it is clear that the symbolgenerator CreateSymbols does not expect or handle the record attribute.

This is most evident from the failure of test/langtools/tools/javac/platform/CanHandleClassFilesTest.java

Additionally, javac generates a MethodParameters for the canonical constructor of a record class. This also trips up the symbol generator. The MethodParameters should likely just be ignored/skipped.

----------System.err:(25/1772)----------
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at CanHandleClassFilesTest.run(CanHandleClassFilesTest.java:117)
at CanHandleClassFilesTest.main(CanHandleClassFilesTest.java:53)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:831)
Caused by: java.lang.IllegalStateException: Unhandled attribute: Record
at build.tools.symbolgenerator.CreateSymbols.readAttribute(CreateSymbols.java:2157)
at build.tools.symbolgenerator.CreateSymbols.inspectClassFile(CreateSymbols.java:1836)
at build.tools.symbolgenerator.CreateSymbols.loadVersionClasses(CreateSymbols.java:1390)
at build.tools.symbolgenerator.CreateSymbols.incrementalUpdate(CreateSymbols.java:1698)
at build.tools.symbolgenerator.CreateSymbols.createIncrementalBaseLine(CreateSymbols.java:1761)
at build.tools.symbolgenerator.CreateSymbols.main(CreateSymbols.java:3942)
... 12 more