Added addSerializer and addDeserializer extensions to SimpleModule for registering KClasses

[Neuman968]

Added extension methods for adding custom serializers and deserializers for a Kotlin KClass that adds both the java class and java type as bound classes.

This allows for registering serializers like

    val objectMapper = jacksonObjectMapper()
            .registerModule(SimpleModule()
                    .addSerializer(Double::class, RoundingSerializer())
                    .addDeserializer(Double::class, RoundingDeserializer()))

Instead of

    val objectMapper = jacksonObjectMapper()
            .registerModule(SimpleModule()
                    .addSerializer(Double::class.javaObjectType, RoundingSerializer())
                    .addSerializer(Double::class.java, RoundingSerializer())
                    .addDeserializer(Double::class.javaObjectType, RoundingDeserializer())
                    .addDeserializer(Double::class.java, RoundingDeserializer()))

Hopefully this can be useful. Thank you for your time and for the awesome project!

[dinomite]

Great improvement! Would you add your info to the release-notes/VERSION-2.x and release-notes/CREDITS-2.x? I'll get this merged to master and it will go out as part of 2.12.

[dinomite]

Ack—I've done it a bit wrong. Just realized that master is tracking Jackson 3.0.0, so I'll fix up the commits I made to put this back on the 2.x tree…

[Neuman968]

@dinomite Thank you for your review! I tried to follow the targeted branches from other PR's out from this project. I originally target it for master but wasn't sure so I changed it to 2.12. I just updated the PR to update release-notes/VERSION-2.x and release-notes/CREDITS-2.x Let me know if there is anything else, glad I can help!

[dinomite]

You did it right, it was my own confusion—I'm still learning the ropes on this project.

[dinomite]

@Neuman968 I forgot to have you sign the CLA—would you fill this out and email a scan/photo of the result to info at fasterxml dot com?

https://github.com/FasterXML/jackson/blob/master/contributor-agreement.pdf