optuna: Use summary instead of log_metric.

[daavoo]

Prevent creation of single-row .tsv files.

Each trial creates a single DVC experiment and logs metrics a single time.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (634f911) 95.70% compared to head (e6c402c) 95.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #514   +/-   ##
=======================================
  Coverage   95.70%   95.71%           
=======================================
  Files          41       41           
  Lines        2587     2588    +1     
  Branches      220      220           
=======================================
+ Hits         2476     2477    +1     
  Misses         66       66           
  Partials       45       45           

Impacted Files	Coverage Δ
src/dvclive/optuna.py	66.66% <100.00%> (ø)
tests/test_frameworks/test_optuna.py	100.00% <100.00%> (ø)

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