exp save: simplify implementation

[dtrifiro]

Gets rid of the queue/executor mechanism to save experiments.

fixes #8680

[dtrifiro]

Gonna add a few more tests

[codecov]

Codecov Report

Base: 93.52% // Head: 93.51% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (8fd6ffb) compared to base (6fc0a6f).
Patch coverage: 98.24% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8690      +/-   ##
==========================================
- Coverage   93.52%   93.51%   -0.02%     
==========================================
  Files         457      457              
  Lines       36128    36121       -7     
  Branches     5224     5229       +5     
==========================================
- Hits        33790    33779      -11     
- Misses       1837     1839       +2     
- Partials      501      503       +2     

Impacted Files	Coverage Δ
tests/unit/repo/experiments/test_utils.py	100.00% <ø> (ø)
dvc/repo/experiments/save.py	94.87% <96.77%> (-5.13%)	⬇️
dvc/repo/experiments/exceptions.py	81.03% <100.00%> (ø)
dvc/repo/experiments/executor/local.py	88.54% <100.00%> (-2.25%)	⬇️
tests/func/experiments/test_save.py	100.00% <100.00%> (ø)
dvc/repo/commit.py	81.81% <0.00%> (-6.07%)	⬇️

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[daavoo]

Probably would be good to update the force description in the cmd (

dvc/dvc/commands/experiments/save.py

Line 52 in 23e4d37

help="Save even if hash value for dependencies/outputs changed.",

):

[jorgeorpinel]

Hi. Are you planning to update docs after this? Not sure if actual behavior will be affected but if so, feel free to take over iterative/dvc.org#4200 to include them there.

[dtrifiro]

Hey @jorgeorpinel, behaviour should be identical to the current implementation, so there's no need to update the docs.