Tan Stella

Add nl means denoising open cv in image processing node

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## Description Added parameters in ImageProcessing node for denoising by OpenCV (NLMeans denoising) Based on https://github.com/alicevision/AliceVision/pull/1181

## Description added a new denoising method (NLMeans from OpenCV) in the ImageProcessing node. ## Features list ## Implementation remarks Implementation inspired by bilateralFilter NLMeans is a 8-bit denoiser so...