Add an example C++ application

[themarpe]

Purpose

To expand oak-examples with native app development (C++) as well

@asdwjure please finalize this and make 2 examples, one UVC and one "generic" (perhaps mimicing some other simpler Python example). CC: @klemen1999

[tersekmatija]

Let's make sure we somehow clearly differentiate between py and cpp examples as well, otherwise this can quickly become confusing. Potentially using cpp prefix for all C++ examples could work. Alternatively, they are placed in a separate folder?

We should document this in README as well.

[klemen1999]

IMO we place all CPP examples in a different, top level folder. We can simply call it cpp or cpp-examples? And if there is more of them we can also split them again into different subfolders inside that one.

This way they can be also easily removed from the python test suite - longerterm it would be nice to also have some cpp runability tests for these ones though if someone wants to add them.