Vendor dask map_coordinates implementation

[astrofrog]

This adds the map_coordinates implementation from https://github.com/dask/dask-image/pull/237 until that PR is merged and released. I decided to just put that in a PR on its own and to then rebase https://github.com/astropy/reproject/pull/532 and use it there, to keep PRs from being too large.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 22.50000% with 31 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 88.66%. Comparing base (4f8e9eb) to head (4c7c836). :warning: Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
reproject/_dask_utils.py	22.50%	31 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
- Coverage   90.12%   88.66%   -1.46%     
==========================================
  Files          30       31       +1     
  Lines        1822     1862      +40     
==========================================
+ Hits         1642     1651       +9     
- Misses        180      211      +31     

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[GenevieveBuckley]

fyi there is a dask-image pre-release with map_coordinates now available: https://github.com/dask/dask-image/releases/tag/v2025.11.0rc1 You should be able to try it out with: pip install --pre dask-image

@astrofrog are you able to try that out and let me know if you find any problems before I make the full release?