multi-cam stitching and nn detections example

[jz592058]

Adding a new example which stitches camera stream from multiple cameras and runs yolo model over the resulting panorama. It uses tiling to make it possible for the panorama to fit inside NN input resolution.

[aljazkonec1]

Overall the logic looks good, I just left some small comments regarding the README. Lets just make sure the tests pass, otherwise thanks!

[jz592058]

@klemen1999 not sure why the test are failing now...

[klemen1999]

This is the error log from both runs (RVC2 and RVC4):
RuntimeError: Number of input streams for stitching must be at least 2.
This makes sense because the testing ATM doesn't support multi-device examples. In this case we should adjust the constants.py in tests/ with corrected reason for why its failing (test suite doesn't support multi-device testing) and set "platform": "all" so its skipped.

[jz592058]

@klemen1999 it seems that something else should be done since again we're seeing
RuntimeError: Number of input streams for stitching must be at least 2.

[klemen1999]

There is a typo in the path in the tests: you have stich instead of stitch
EDIT: Fixed