feat(docs): support doc-hover-service

[weird94]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[github-actions]

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📑 Examples	📚 Storybook
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 85 lines in your changes missing coverage. Please review.

Project coverage is 26.70%. Comparing base (ab242a3) to head (2a65730).

Files	Patch %	Lines
.../docs-ui/src/services/doc-hover-manager.service.ts	0.00%	60 Missing ⚠️
.../render-controllers/doc-hover.render-controller.ts	0.00%	18 Missing ⚠️
packages/core/src/observer/observable.ts	0.00%	5 Missing ⚠️
packages/docs/src/basics/selection.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2824      +/-   ##
==========================================
- Coverage   26.71%   26.70%   -0.02%     
==========================================
  Files        1772     1773       +1     
  Lines       93507    93552      +45     
  Branches    19926    19931       +5     
==========================================
  Hits        24982    24982              
- Misses      68525    68570      +45     

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[wzhudev]

LGTM