Add new cds-access-api proxies

Add new cds-access-api proxies

Externalizable serialization format record class hierarchy, which leads
to significant overheads. This patch introduces proxies which are are
flat, i.e. have java.Object as their superclass, eliminating this
overhead.

The way we do this is we defined SerialForm interfaces which extend
Externalizable and define the serialization protocol in terms of default
methods. We then define a bunch of classes which are pure data holders
implementing individual SerialForms.

Also ensure messages properly implement cloneAsVersion() to propagate
the target version, now that it matters for them.

Finally audit use of java.io.Serial so that we do not import it -- it is
just pure overhead vs. using @java.io.Serial directly.

JIRA: CONTROLLER-2051
Change-Id: I01132665027687edc1c6d44dda8a6ab0cab6ad6a
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>