Feat/jupyterlab optuna

[porink0424]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
Make sure that you understand the consequences concerning licenses and check the box below if you accept the term before creating this pull request.

• I agree this patch may be ported to Goptuna by other Goptuna contributors.

Reference Issues/PRs

Branched from #901, merging works of #904

What does this implement/fix? Explain your changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.58%. Comparing base (cc0ab0f) to head (1015314).
Report is 32 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #903   +/-   ##
=======================================
  Coverage   69.58%   69.58%           
=======================================
  Files          35       35           
  Lines        2377     2377           
=======================================
  Hits         1654     1654           
  Misses        723      723           

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