Proposal: function to create a raster from a bounding box

[phargogh]

In the HRA rewrite, it was helpful to be able to create a raster directly from a bounding box (function implementation and where it's used) rather than by creating a vector of the bbox for the more circuitous pygeoprocessing.create_raster_from_vector_extents.

I propose creating a new function that derives from the HRA implementation with the following modifications:

• The raster driver and creation options are exposed as a function parameter, defaulting to the standard GTiff driver and creation options
• target_nodata will be a required parameter, to match create_raster_from_vector_extents.
• The function signature will be updated to be more consistent with pygeoprocessing's existing apis.