Add demultiplexing functionality

[zktuong]

Preliminary implementation to address #652

For a single multiplexed folder:

singularity run -B $PWD sc-dandelion_latest.sif  dandelion_preprocess \
  --meta demux.csv \
  --meta_cell_id_col cell_id \
  --meta_individual_col individual

For multiple source folders:

singularity run -B $PWD sc-dandelion_latest.sif  dandelion_preprocess \
  --meta demux.csv \
  --meta_cell_id_col cell_id \
  --meta_individual_col individual \
  --meta_sample_col source_sample

If they want output folders named differently from individual:

singularity run -B $PWD sc-dandelion_latest.sif  dandelion_preprocess \
  --meta demux.csv \
  --meta_cell_id_col cell_id \
  --meta_individual_col individual \
  --meta_output_col output_sample

For .h5ad metadata:

• pass --meta adata.h5ad
• the same column args apply, but columns are read from .obs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.26%. Comparing base (9094852) to head (b683048).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #653   +/-   ##
=======================================
  Coverage   90.25%   90.26%           
=======================================
  Files          37       37           
  Lines       12434    12434           
=======================================
+ Hits        11222    11223    +1     
+ Misses       1212     1211    -1     

Flag	Coverage Δ
ubuntu-latest-3.13-auto	88.37% <ø> (ø)
ubuntu-latest-3.13-pandas	65.12% <ø> (+<0.01%)	⬆️

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