E2E FPS benchmark tests

[dtronmans]

Purpose

• Any model can be added to the benchmark_targets.json it will be automatically picked up by the test suite
• Tested on RVC4 device, just need to run this: pytest tests/test_benchmark/ --device-ip <ip>
• Had to expand the threshold to 10 percent lower, specifically the tests/test_benchmark/test_benchmark_regression.py::test_benchmark_fps[yolov6-nano:r2-coco-512x288] was showing 6 percent lower sometimes but that is probably because the base fps (841.98) is quite a large number
• For now this doesn't run with CI, even though it's in the /tests directory, unittests.yaml only runs tests/test_utils

Specification

Dependencies & Potential Impact

Deployment Plan

Testing & Validation