Rio-tiler

* deprecate `resampling_method` in `rio_tiler.io.xarray.XarrayReader` method and add `reproject_method` (to match the `rio_tiler.io.Reader` options)

python
before
with XarrayReader(data) as dst:
img = dst.tile(0, 0, 1, resampling_method="cubic")

now
with XarrayReader(data) as dst:
img_cubic = dst.tile(0, 0, 1, reproject_method="cubic")

* When overriding **nodata**, do not mix mask and only use the provided nodata value

* 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