Add support for optional serializer generation.

[tkieft]

This will allow the user to enable or disable the generation of serializer code on a per-class or global basis, saving on code size and method count.

[ttung]

You could save just as many methods if you made the String <-> Object serializer/deserializer optional. :)

[tkieft]

String <-> Object do you think that's actually a good idea? The reason I did this is that we rarely use serializers, and this also saves us from writing serializeCodeFormatters.

[tkieft]

I guess we mostly use the parseFromJson(jp) version, but for serializers I imagine the String version is more widely used.

[ttung]

We mostly just use parseFromJson(jp), and we mostly just use serializeToJson(JsonGenerator,...

Only the top-level objects would ever use the string versions.

[tkieft]

@ttung good point. I suppose that could be a separate feature request :)

[tkieft]

ping?

[ttung]

Sorry. Github is not the greatest at notifying when a PR has been updated. As in it doesn't.