Rio-tiler

* do not use `warpedVRT` when overwriting the dataset nodata value

* add `align_bounds_with_dataset` option in `rio_tiler.reader.part` to align input bounds with the dataset resolution

<img src="https://github.com/cogeotiff/rio-tiler/assets/10407788/0e340d3d-e5d9-4558-93f7-3f307c017510" style="max-width: 500px;">

* remove default Endpoint URL in AWS S3 Client for STAC Reader

* fix AWS endpoint credential for STAC `fetch` function, using same defaults as GDAL vsis3 configuration

* apply `discrete` colormap when the provided colormap does not have 256 values

* Adjusting dataset latitude for WarpedVRT parameters calculation when EPSG:4326 dataset latitudes overflows EPSG:3857 min/max latitude (https://github.com/cogeotiff/rio-tiler/pull/660)

* validate `shape` in `ImageData.get_coverage_array` to avoid rasterio error when re-projecting the geometry