Allow user to configure ObjectMapper we use for MessagePack serialization/deserialization

[wtgodbe]

We should allow users to set strategies used by the ObjectMapper we use in the Java clients' MessagePack implementation (using the ObjectMapper.configure() method on our end). For example, https://fasterxml.github.io/jackson-databind/javadoc/2.5/com/fasterxml/jackson/databind/MapperFeature.html to configure deserialization, or https://fasterxml.github.io/jackson-databind/javadoc/2.8/com/fasterxml/jackson/databind/PropertyNamingStrategy.html to configure how property names are serialized. Right now all property names are serialized as if they were camelCase, even if the user defined them as PascalCase.

CC @BrennanConroy @halter73

[wtgodbe]

Moving into 6.0 since this would be an API change

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