enhance highgui module with hardware acceleration

[nihui]

cv::imread / cv::imdecode

• [x] jpeg on milkv-duo
• [ ] jpeg on yuzuki-lizard
• [x] jpeg on tinyvision

cv::imwrite / cv::imencode

• [ ] jpeg on milkv-duo
• [ ] jpeg on yuzuki-lizard
• [x] jpeg on tinyvision
• [x] jpeg on luckfox-pico

cv::VideoCapture

• [x] v4l camera on luckfox-pico
• [x] v4l camera on tinyvision
• [x] cvi camera on milkv-duo