Add `distribution` prop to `SearchSpaceItem` type and move `searchSpace` to `tslib/react`

[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.

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

Reference Issues/PRs

NA

What does this implement/fix? Explain your changes.

• Added distribution prop to SearchSpaceItem type
• Moved searchSpace.ts from optuna_dashboard/ts to tslib/react
• Removed unnecessary margins added to vscode/package-lock.json by #890

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.58%. Comparing base (0beb2af) to head (747098b). Report is 71 commits behind head on main.

:exclamation: Current head 747098b differs from pull request most recent head 29c4e73

Please upload reports for the commit 29c4e73 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #892 +/- ## ========================================== + Coverage 69.51% 69.58% +0.06% ========================================== Files 35 35 Lines 2375 2377 +2 ========================================== + Hits 1651 1654 +3 + Misses 724 723 -1 ```

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