n_components parameter for sc.tl.tsne

[TarikExner]

Dear scanpy-team,

thank you very much for this great package!

Similar to issues https://github.com/scverse/scanpy/issues/1435 and https://github.com/scverse/scanpy/issues/460 I am interested in having an n_components parameter in the sc.tl.tsne function.

Apparently, the commit was made but no pull request was opened back in 2019.

I added the necessary parameter to the arguments and passed them via the params_sklearn dict to the respective function.

Documentation is also updated.

If you feel there is a need for a separate test, let me know, happy to include one.

Best,
Tarik

[codecov]

Codecov Report

Merging #2671 (3abf5c2) into master (0d4c6d2) will increase coverage by 0.00%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2671   +/-   ##
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  Coverage   72.16%   72.16%           
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  Files         108      108           
  Lines       11908    11908           
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+ Hits         8593     8594    +1     
+ Misses       3315     3314    -1     

Files Changed	Coverage Δ
scanpy/tools/_tsne.py	90.00% <ø> (ø)

... and 1 file with indirect coverage changes