A new algorithm has been added that extracts extrema (minimum and maximum) values from a given band of the input raster layer.
The output is a vector layer containing point features for the selected extrema, at the center of the associated pixel.
If multiple pixels in the raster share the minimum or maximum value, then only one of these pixels will be included in the output.
The algorithm uses raster iterator to remain efficient on huge rasters, and does not require reading the entire raster to memory