Add Jackson XML proguard rules to the SDK

[Talhaali00]

We can't build the samples with the following Proguard rules

-keepnames class com.fasterxml.jackson.** { *; }
-dontwarn com.fasterxml.jackson.databind.**

We need to figure out how we can add these rules to the SDK so that applications will not need to add the rules themselves

[XRPHIBBO]

Already