Issue title: Support for protobuf binary format
 Issue body: **Is your feature request related to a problem? Please describe.**
I would like ARC to support protobuf binary format. Basically, don't want to see binary data on screen but convert body to protobuf binary format body and do the same on response. 

**Describe the solution you'd like**
User will enter normal json data in request, ARC should convert json into protobuf format and send the request and vice-versa when request gets received.

**Additional context**
https://developers.google.com/protocol-buffers/docs/proto3
https://developers.google.com/protocol-buffers/docs/encoding

 Comments: 
 Comment 0: This issue has been automatically marked as stale because it has not had recent activity and is not currently prioritized. It will be closed in a week if no further activity occurs :)

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