[processing] Add algorithm to extract min/max pixel from raster (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#59332
Author: @nyalldawson
QGIS version: 3.42

[processing] Add algorithm to extract min/max pixel from raster

PR Description:

This algorithm extracts extrema (minimum and maximum) values from a given band of the 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

Commits tagged with [need-docs] or [FEATURE]