Fix to xr dataset merge error with conflicting values in coordinate

[BENR0]

Fixes the merge error Problem by allowing to pass the compat argument.

• Closes MergeError in to_xarray_dataset for Scenes containing data from seviri_l1b_nc reader #2179
• Tests added
• Fully documented

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (0589f61) to head (42410d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2827      +/-   ##
==========================================
- Coverage   96.10%   96.10%   -0.01%     
==========================================
  Files         377      377              
  Lines       55162    55177      +15     
==========================================
+ Hits        53012    53026      +14     
- Misses       2150     2151       +1     

Flag	Coverage Δ
behaviourtests	3.94% <4.34%> (-0.01%)	⬇️
unittests	96.19% <100.00%> (-0.01%)	⬇️

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[djhoese]

This looks good to me except the type annotation on compat which I've commented on inline. If that is resolved then this is good to merge.

[djhoese]

The failing test output really doesn't help determine what is wrong/unequal for that test.

[coveralls]

Pull Request Test Coverage Report for Build 12180160048

Details

• 23 of 23 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.001%) to 96.207%

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Files with Coverage Reduction	New Missed Lines	%
satpy/scene.py	1	92.25%

Totals
Change from base Build 12165642437:	-0.001%
Covered Lines:	53270
Relevant Lines:	55370

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💛 - Coveralls