fix(comp:tooltip): tooltip content should wrap on line break

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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?

tooltip 组件内容的white-space不允许换行

What is the new behavior?

1. 提供 whiteSpace 主题变量，可以配置内容是否可以换行
2. 默认的 whiteSpace 为 pre-wrap

Other information

如果这个修改对业务有影响，自定义主题变量可以解决

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.79%. Comparing base (49eb4ea) to head (9428ac4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1876   +/-   ##
=======================================
  Coverage   90.79%   90.79%           
=======================================
  Files         359      359           
  Lines       35225    35225           
  Branches     2805     2805           
=======================================
  Hits        31981    31981           
  Misses       3244     3244           

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