add zoom range and resolution in metadata output

[vincentsarago]

Having those could be useful IMO

[DanSchoppe]

@vincentsarago Are you thinking this would be slippy map zoom level information (min zoom, max zoom), or physical units (ground sample distance in eg. meters/pixel)? Or maybe both??

[vincentsarago]

@DanSchoppe both 😄

[vincentsarago]

but as for cogeotiff/rio-cogeo#62 (comment) we need to figure out how to take care (or not) of the latitude in the calculation

[vincentsarago]

let's add band_names (band description) too ;-)

    with rasterio.open(src_path) as src_dst:
        idx = indexes if indexes else src_dst.indexes
        def _get_name(ix):
            try:
                name = src_dst.descriptions[ix - 1]
                if not name:
                    name = f"band{ix}"
            except IndexError:
                name = f"band{ix}"
            return name
        band_names = [_get_name(ix) for ix in idx]  

[vincentsarago]

done in #97