Go: mutate objects in place in RPC receiver

[greg-at-moderne]

What's changed?

Change the RPC visitor implementation for Go. Mutate the objects in place, just like we do for other languages.

What's your motivation?

Otherwise the recipe run might fail with:

java.lang.IllegalArgumentException: No enum constant org.openrewrite.java.tree.JavaType.FullyQualified.Kind.
  at org.openrewrite.java.tree.JavaType$FullyQualified$Kind.valueOf(JavaType.java:389)
  at org.openrewrite.java.internal.rpc.JavaTypeReceiver.lambda$visitClass$7(JavaTypeReceiver.java:74)

if you have a cycle in type attributions.