Trace http and grpc body

[Volodymyr-Maiboroda-Imprivata]

Hi guys, I'm trying to use opentelemetry javaagent in our application. We need to trace HTTP and grpc bodies.
Is there a possible way to configure it?

[trask]

hi @Volodymyr-Maiboroda-Imprivata! check out #1317, https://github.com/open-telemetry/opentelemetry-specification/issues/1062 and https://github.com/open-telemetry/opentelemetry-specification/issues/1284 (cc: @pavolloffay)