Build-time feature selection: MessageBus support

# 🚀 Feature Request

### Relevant Package [**REQUIRED**]

This feature request is for... C device SDK

### Description [**REQUIRED**]
Add the ability at build time to configure out/in the different MessageBus implementations, ie Redis, MQTT, NATS (if #428 is implemented)

### Describe the solution you'd like
The build script could take a cmdline flag which would set an environment variable, this variable to be read by the CMake files to control source files and link libraries

### Describe alternatives you've considered
Have you considered any alternative solutions or workarounds?