feat✨: 增加虚拟滚动

[zkp442910864]

增加了简陋的虚拟滚动功能
通过 virtual 和 virtualRowHeight 属性开启虚拟滚动功能
希望大哥把功能集成进去，完善功能

[codecov]

Codecov Report

Attention: Patch coverage is 1.36054% with 145 lines in your changes missing coverage. Please review.

Project coverage is 85.70%. Comparing base (9ae16b6) to head (143ff8f).

Files with missing lines	Patch %	Lines
src/components/Option3.vue	0.68%	144 Missing ⚠️
src/components/Menu.vue	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #470       +/-   ##
===========================================
- Coverage   97.68%   85.70%   -11.99%     
===========================================
  Files          27       28        +1     
  Lines        1037     1182      +145     
  Branches      104      137       +33     
===========================================
  Hits         1013     1013               
- Misses          9      153      +144     
- Partials       15       16        +1     

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