KV API use of prefix

[kozlovic]

Overview

This is to conform to ADR-19.

Clients and Tools

• [x] Go @wallyqs
• [x] Java @scottf
• [x] JavaScript @aricart
• [x] .Net @ColinSullivan1 @scottf
• [X] C @kozlovic
• [ ] Python @wallyqs
• [ ] Ruby @wallyqs
• [ ] Rust @Jarema

Other Tasks

• [ ] docs.nats.io updated
• [ ] Update ADR to Implemented
• [x] Update client features spreadsheet

Client authors please update with your progress. If you open issues in your own repositories as a result of this request, please link them to this one by pasting the issue URL in a comment or main issue description.