Support constraints in slice plot

[knshnb]

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

This PR adds constraint support to the dashboard, which was previously introduced in optuna: optuna/optuna#4906.

What does this implement/fix? Explain your changes.

• plot infeasible trials in gray with the label "Infeasible Trial"

[codecov]

Codecov Report

Merging #688 (5076818) into main (2c50b5a) will not change coverage.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #688   +/-   ##
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  Coverage   62.88%   62.88%           
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  Files          35       35           
  Lines        2250     2250           
=======================================
  Hits         1415     1415           
  Misses        835      835           

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[HideakiImamura]

@not522 Could you review this PR?

[HideakiImamura]

LGTM. I confirmed that the change of this PR generates the following figure in the dashboard.

[not522]

LGTM!