Fix curvilinear lazy regridding

[stephenworsley]

Curvilinear regridding is currently bugged when the data is lazy. I think this might also be fixed in #198, but this should also fix it in the short term. #198 will have to be refactored in light of this.

[codecov[bot]]

Codecov Report

Merging #242 (8e34456) into main (55b8354) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #242   +/-   ##
=======================================
  Coverage   99.36%   99.37%           
=======================================
  Files          28       28           
  Lines        2829     2864   +35     
=======================================
+ Hits         2811     2846   +35     
  Misses         18       18           

Impacted Files	Coverage Δ
esmf_regrid/experimental/unstructured_scheme.py	98.50% <100.00%> (ø)
esmf_regrid/schemes.py	97.77% <100.00%> (ø)
...nstructured_scheme/test_GridToMeshESMFRegridder.py	100.00% <100.00%> (ø)
...nstructured_scheme/test_MeshToGridESMFRegridder.py	100.00% <100.00%> (ø)
.../schemes/test_regrid_rectilinear_to_rectilinear.py	100.00% <100.00%> (ø)

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[lbdreyer]

Thanks @stephenworsley