Conversion functions between formats

[gtca]

Implements .to_anndata() and .to_mudata() as proposed in #14.

[codecov-commenter]

Codecov Report

Merging #54 (01a3cc7) into mudata-0.3 (29b5a11) will increase coverage by 0.97%. Report is 5 commits behind head on mudata-0.3. The diff coverage is 75.81%.

Additional details and impacted files

@@              Coverage Diff               @@
##           mudata-0.3      #54      +/-   ##
==============================================
+ Coverage       69.12%   70.09%   +0.97%     
==============================================
  Files              14       17       +3     
  Lines            1671     1879     +208     
==============================================
+ Hits             1155     1317     +162     
- Misses            516      562      +46     

Files Changed	Coverage Δ
mudata/_core/io.py	64.43% <39.18%> (-5.63%)	:arrow_down:
mudata/_core/mudata.py	63.92% <78.43%> (+1.24%)	:arrow_up:
mudata/_core/to_.py	88.46% <88.46%> (ø)
mudata/__init__.py	100.00% <100.00%> (ø)
tests/test_repr.py	100.00% <100.00%> (ø)
tests/test_to_.py	100.00% <100.00%> (ø)
tests/test_view_copy.py	100.00% <100.00%> (ø)