feat: stalign with a fit apply pattern. Also foundation for imputation

[selmanozleyen]

Continuation of #1162

[codecov]

Codecov Report

❌ Patch coverage is 45.00000% with 308 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.32%. Comparing base (a9966fd) to head (96bc445).

Files with missing lines	Patch %	Lines
...ntal/_methods/align_samples/_stalign_impl/_core.py	0.00%	156 Missing ⚠️
...l/_methods/align_samples/_stalign_impl/_helpers.py	0.00%	73 Missing ⚠️
...tal/_methods/align_samples/_stalign_impl/_tools.py	51.94%	37 Missing ⚠️
...experimental/_methods/align_landmarks/_landmark.py	84.12%	6 Missing and 4 partials ⚠️
...py/experimental/_methods/align_samples/_stalign.py	37.50%	9 Missing and 1 partial ⚠️
src/squidpy/experimental/tl/_align/_api.py	72.22%	9 Missing and 1 partial ⚠️
src/squidpy/experimental/_methods/_protocols.py	66.66%	2 Missing and 3 partials ⚠️
src/squidpy/experimental/tl/_align/_io.py	93.90%	3 Missing and 2 partials ⚠️
src/squidpy/experimental/_methods/_registry.py	94.59%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1195      +/-   ##
==========================================
- Coverage   75.32%   73.32%   -2.00%     
==========================================
  Files          56       66      +10     
  Lines        7936     8496     +560     
  Branches     1295     1364      +69     
==========================================
+ Hits         5978     6230     +252     
- Misses       1447     1743     +296     
- Partials      511      523      +12     

Files with missing lines	Coverage Δ
src/squidpy/experimental/_methods/_families.py	100.00% <100.00%> (ø)
src/squidpy/experimental/_methods/_registry.py	94.59% <94.59%> (ø)
src/squidpy/experimental/_methods/_protocols.py	66.66% <66.66%> (ø)
src/squidpy/experimental/tl/_align/_io.py	93.90% <93.90%> (ø)
...experimental/_methods/align_landmarks/_landmark.py	84.12% <84.12%> (ø)
...py/experimental/_methods/align_samples/_stalign.py	37.50% <37.50%> (ø)
src/squidpy/experimental/tl/_align/_api.py	72.22% <72.22%> (ø)
...tal/_methods/align_samples/_stalign_impl/_tools.py	51.94% <51.94%> (ø)
...l/_methods/align_samples/_stalign_impl/_helpers.py	0.00% <0.00%> (ø)
...ntal/_methods/align_samples/_stalign_impl/_core.py	0.00% <0.00%> (ø)

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