Dandelion io

[amoschoomy]

Closes #475

• Updated scirpy.io from_dandelion and to_dandelion functions
• Test fixture for dandelion is updated to reflect umi_count changes in dandelion
• Specify sc-dandelion dependency to be at least 0.35 ( in accordance to dandelion changes)

[amoschoomy]

awaiting dandelion package to be updated to 0.35

[amoschoomy]

Dandelion 0.35 also will integrate umi_count changes as mentioned in #487 (comment) so the test_io.py have also been updated as well

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d776d01) 81.04% compared to head (22c2f27) 81.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
- Coverage   81.04%   81.00%   -0.04%     
==========================================
  Files          49       49              
  Lines        3972     3959      -13     
==========================================
- Hits         3219     3207      -12     
+ Misses        753      752       -1     

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[amoschoomy]

@grst this PR is ready to be reviewed

[grst]

Thanks, LGTM!