Improve Zonal Stats implementation

[NyakudyaA]

Feature description

Currently, the Zonal stats algorithm aligns properly with PostGIS Raster, python package rasterstats values. I think QGIS would benefit from implementing some of the options available in rasterstats

Rasterization Strategy

Described at https://pythonhosted.org/rasterstats/manual.html#rasterization-strategy

Looking at the results I get from running zonal stats in QGIS and comparing this with the one found after using rasterstats, I believe QGIS implements the option all_touched=True

Maybe we could also provide this as an option in the GUI so that users can choose the rasterisation strategy

working-with-categorical-rasters

Described at https://pythonhosted.org/rasterstats/manual.html#working-with-categorical-rasters
I haven't tried this in QGIS to see how it works but if it doesn't do this, maybe we could implement it

Additional context

No response