Some fixes and maintenance

[Kirill888]

• put back warp_affine alias
• use spatial_ref.attrs['GeoTransform'] as true geobox when spatial coordinates contain NaN, needed for lazy open of remote zarrs without reading coords from slow/inaccessible sources.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.45%. Comparing base (78577dc) to head (87d18f4).

Files	Patch %	Lines
odc/geo/_xr_interop.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #166 +/- ## =========================================== - Coverage 95.48% 95.45% -0.03% =========================================== Files 31 31 Lines 5489 5497 +8 =========================================== + Hits 5241 5247 +6 - Misses 248 250 +2 ```

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