Backport PR #2932 on branch 1.3.x (feat: Custom dataloader registry support)

[meeseeksmachine]

Backport PR #2932: Custom dataloader registry support

[codecov]

Codecov Report

Attention: Patch coverage is 81.67614% with 129 lines in your changes missing coverage. Please review.

Project coverage is 80.16%. Comparing base (7236446) to head (202f8b4).
Report is 1 commits behind head on 1.3.x.

Files with missing lines	Patch %	Lines
src/scvi/model/base/_base_model.py	49.63%	69 Missing ⚠️
src/scvi/dataloaders/_custom_dataloders.py	91.59%	29 Missing ⚠️
src/scvi/model/base/_archesmixin.py	82.22%	8 Missing ⚠️
src/scvi/model/base/_training_mixin.py	76.47%	8 Missing ⚠️
src/scvi/model/_scanvi.py	86.66%	4 Missing ⚠️
src/scvi/model/base/_rnamixin.py	93.33%	4 Missing ⚠️
src/scvi/model/base/_vaemixin.py	77.77%	4 Missing ⚠️
src/scvi/data/_utils.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            1.3.x    #3318      +/-   ##
==========================================
+ Coverage   80.12%   80.16%   +0.04%     
==========================================
  Files         196      197       +1     
  Lines       17570    18156     +586     
==========================================
+ Hits        14078    14555     +477     
- Misses       3492     3601     +109     

Files with missing lines	Coverage Δ
src/scvi/dataloaders/__init__.py	100.00% <100.00%> (ø)
src/scvi/dataloaders/_data_splitting.py	95.47% <ø> (ø)
src/scvi/model/_scvi.py	96.42% <100.00%> (+0.51%)	⬆️
src/scvi/model/base/_save_load.py	83.49% <100.00%> (+1.38%)	⬆️
src/scvi/train/_trainingplans.py	85.73% <100.00%> (+0.41%)	⬆️
src/scvi/data/_utils.py	85.00% <57.14%> (-1.13%)	⬇️
src/scvi/model/_scanvi.py	91.17% <86.66%> (-1.85%)	⬇️
src/scvi/model/base/_rnamixin.py	94.17% <93.33%> (-0.36%)	⬇️
src/scvi/model/base/_vaemixin.py	89.13% <77.77%> (+1.17%)	⬆️
src/scvi/model/base/_archesmixin.py	78.20% <82.22%> (+1.31%)	⬆️
... and 3 more

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