RFR: Mark not subclassable classes final in java.base exported classes

[Eirik Bjørsnøs]

Hi,

I have drafted a CSR for JDK-8344943 which is now ready for an initial
round of reviews:

https://bugs.openjdk.org/browse/JDK-8345054

The CSR adds the "final" modifier to 21 classes in java.base which are
today "effectively not subclassable", but not marked as such.

In addition to simply adding the final modifier, the CSR suggests minor
updates to the classes DynamicCallSiteDesc, ModuleDescriptor and
InterfaceAddress to better express them being non-subclassable. Owners of
these classes are especially welcome to comment on the CSR.

The specification changes may be easier to read in the draft PR:
https://github.com/openjdk/jdk/pull/22389/files

Thanks,
Eirik
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