feat: support lazy load demo

[chenshuai2144]

close ant-design/pro-components@#6996

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Name	Status	Preview	Updated (UTC)
dumi-theme-antd-style	✅ Ready (Inspect)	Visit Preview	May 6, 2023 7:36am

[codecov[bot]]

Codecov Report

Merging #44 (946d064) into master (5dce3a3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   48.74%   48.74%           
=======================================
  Files          49       49           
  Lines        2907     2907           
  Branches       36       36           
=======================================
  Hits         1417     1417           
  Misses       1490     1490           

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[github-actions[bot]]

:tada: This PR is included in version 0.25.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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