Fix inconsistent handling of RasterSourceConfig.bbox's type

[AdeelH]

Overview

This PR makes it so that RasterSourceConfig.bbox is always a tuple, to allow it to be serialized and deserialized by pydantic.

Motivation: previously, RasterSourceConfig.bbox was defined as a tuple in the RasterSourceConfig definition, but was automatically converted to a Box in its pydantic validator. This meant that although the field could be initialized as a Box, it could not be serialized by pydantic. This was not caught in the integration tests, because none of them use the bbox field.

The error can be reproduced by e.g. adding bbox=(0, 0, 328, 1342) to RasterioSourceConfig the chip_classification.basic integration test.

Checklist

• Added needs-backport label if PR is bug fix that applies to previous minor release
• Ran scripts/format_code and committed any changes
• Documentation updated if needed
• PR has a name that won't get you publicly shamed for vagueness

Notes

This PR is an alternative to #1895.

Testing Instructions

• See new unit tests.
• Check if chip_classification.basic integration test runs with bbox=(0, 0, 328, 1342) added to RasterioSourceConfig.

[AdeelH]

@jamesmcclain please check if this fix works as well as #1895.

[jamesmcclain]

@jamesmcclain please check if this fix works as well as #1895.

I'll give it a try first thing tomorrow 👍

[codecov]

Codecov Report

Merging #1899 (9dc948f) into master (6249e01) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1899      +/-   ##
==========================================
- Coverage   81.56%   81.56%   -0.01%     
==========================================
  Files         190      190              
  Lines        9283     9282       -1     
==========================================
- Hits         7572     7571       -1     
  Misses       1711     1711              

Files Changed	Coverage Δ
...on/core/data/raster_source/raster_source_config.py	48.00% <ø> (-10.07%)	⬇️
...e/data/raster_source/multi_raster_source_config.py	81.39% <100.00%> (+0.90%)	⬆️
.../core/data/raster_source/rasterio_source_config.py	56.52% <100.00%> (+4.14%)	⬆️
...ore/data/raster_source/rasterized_source_config.py	100.00% <100.00%> (ø)

[jamesmcclain]

@jamesmcclain please check if this fix works as well as #1895.

I'll give it a try first thing tomorrow 👍

@AdeelH Yes, it works 👍 👍 . Many thanks for this 🙏