fix(comp:theme): store theme style reference count on style element

[sallerli1]

PR Checklist

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

在微前端框架中，如果存在了两个版本的idux，子应用的themeProvider上下文销毁时，会清除掉全局的主题变量style元素

What is the new behavior?

修复以上问题，将style元素的引用次数绑定在style元素上

Other information

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (425def0) to head (d4d8119).
Report is 1 commits behind head on main.

❗ Current head d4d8119 differs from pull request most recent head 578508f. Consider uploading reports for the commit 578508f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1907   +/-   ##
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  Coverage   90.75%   90.75%           
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  Files         359      359           
  Lines       35285    35285           
  Branches     2807     2807           
=======================================
  Hits        32023    32023           
  Misses       3262     3262           

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