RFR: JDK-8310835: Address gaps in -Xlint:serial checks

[Joe Darcy]

On Sat, 24 Jun 2023 22:27:32 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Improve serial lint messages for externalizable records (and potentially other situations).

Note the design center for warnings about Externalizable types is somewhat different than for just Serializable types since Externalizable is an interface that defines methods and the compiler can checked whether or not those methods are implemented by a class (unlike for Serialization where the methods can be and by convention are private).

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PR Comment: https://git.openjdk.org/jdk/pull/14639#issuecomment-1635104795