Support MessageBodyWriter/Reader in JAX-RS instrumentation for bodies

[pavolloffay]

The JAX-RS client can accept any java type as entity to be send/received. This entity is serialized/deserialized via MessageBodyWriter/Reader.

We have two options - instrument MessageBodyWriter/Reader or instrument input/output streams.

https://eclipse-ee4j.github.io/jersey.github.io/documentation/latest/message-body-workers.html