DWM1001 & Zephyr: open source port + example code

@FredericM this is indeed a great contribution especially adding the Bluetooth functionality. I have suggestions or at least information to share on how this could get even more Zephyr friendly. When using Zephyr, people usually combine multiple projects so it’s nice when a project can behave like a west.yml dependency and have its own configuration flag to be easily enabled or disabled. I have an example integration I mentioned here Zephyr driver, C++ high level API, nRF mesh and Two Way Ranging GPIO Profiling

The way how such an amount of examples could be even more useful is to add pack them all in a library and allow them to be called through remote procedure call, that’s what I’m trying to achieve, for that I added simply a c++ json layer for request response. In my case I used simplemesh but as you have bluetooth many people are trying to combine bluetooth mesh with such an RPC system as openthread does not run on all existing nRF52832 devices.