Allow ESMF arguments to be passed

[stephenworsley]

Addresses #375 and #391.

[codecov]

Codecov Report

Attention: Patch coverage is 92.70073% with 10 lines in your changes missing coverage. Please review.

Project coverage is 98.30%. Comparing base (9e2559a) to head (6c23d65).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
esmf_regrid/schemes.py	82.22%	8 Missing ⚠️
esmf_regrid/__init__.py	0.00%	1 Missing ⚠️
esmf_regrid/experimental/io.py	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #396      +/-   ##
==========================================
- Coverage   98.39%   98.30%   -0.09%     
==========================================
  Files          37       37              
  Lines        4293     4420     +127     
==========================================
+ Hits         4224     4345     +121     
- Misses         69       75       +6     

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