End to End Message Encryption Support in GO Client

**Is your feature request related to a problem? Please describe.**
Currently End to End Encryption is not support for the Pulsar GO Client Library. As a user of Pulsar I have many services that are in GO and Java. I would like to leverage message encryption for all my services. Currently it can be done with my clients written in Java, but not in GO.

**Describe the solution you'd like**
I've taken a look at the research here https://github.com/apache/pulsar/wiki/PIP-4:-Pulsar-End-to-End-Encryption
Also at the changes made for the java client library https://github.com/apache/pulsar/pull/731/files

Basically it would be the same solution implemented in GO. I know there is support in the C++ and Java libraries.

**Describe alternatives you've considered**
I was potentially looking at using the c++ solution with GO. I'm not sure if it would be possible. I saw support for encryption for c++ here https://github.com/apache/pulsar/blob/master/pulsar-client-cpp/include/pulsar/ConsumerConfiguration.h#L228

Also I know there is a CGO Library. https://pulsar.apache.org/docs/en/client-libraries-cgo/

I'm not sure if they would be compatible though.