Add option to select by burstId in crop_burst_dataset

[aurghs]

close #80

Things to do:

• update code
• add tests (need a newer image)
• document the new option

[codecov-commenter]

Codecov Report

Merging #100 (b1b518e) into main (9602897) will increase coverage by 0.44%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
+ Coverage   91.02%   91.46%   +0.44%     
==========================================
  Files          12       12              
  Lines         880      914      +34     
  Branches       96      100       +4     
==========================================
+ Hits          801      836      +35     
  Misses         57       57              
+ Partials       22       21       -1     

Impacted Files	Coverage Δ
tests/test_20_sentinel1.py	98.07% <100.00%> (+0.16%)	⬆️
tests/test_30_xarray_backends.py	100.00% <100.00%> (ø)
xarray_sentinel/sentinel1.py	87.20% <100.00%> (+0.67%)	⬆️

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