fix(api): return model and summary in highlevel fit

[hanxiao]

No description provided.

[bwanglzu]

lgtm! Ill apply some more robust testing to assert ndim of output model and weights are updated.

[codecov]

Codecov Report

Merging #175 (03053f0) into main (115a0aa) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   87.29%   87.28%   -0.02%     
==========================================
  Files          25       25              
  Lines        1196     1195       -1     
==========================================
- Hits         1044     1043       -1     
  Misses        152      152              

Flag	Coverage Δ
finetuner	87.28% <50.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
finetuner/tuner/summary.py	94.33% <ø> (-0.11%)	⬇️
finetuner/__init__.py	70.37% <50.00%> (ø)

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