Provide ability to delete no_data value.

[metasim]

Issue

There's no way to delete a no_data value in a RasterBand.

Commentary

Symmetry in the read vs. write is confusing. i.e. you can determine if there's no no_data value thanks to the return type Option<f64>:

gdal/src/raster/rasterband.rs

Line 389 in fb6e260

pub fn no_data_value(&self) -> Option<f64> {

But the write method only accepts f64:

gdal/src/raster/rasterband.rs

Line 400 in fb6e260

pub fn set_no_data_value(&mut self, no_data: f64) -> Result<()> {

Changing this parameter to Option<f64> would be a breaking change, but would improve the API. The other option is to have a fn delete_no_data(&mut self) -> Result<()> method which would be non-breaking, but less idiomatic on the Rust side.

[metasim]

This would be an easy PR to fix, but advice from the maintainers on the desired approach would be a prerequisite.