chore(vant-use): use Rslib to build

[chenjiahan]

https://github.com/web-infra-dev/rslib

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.60%. Comparing base (3884730) to head (92dfd4b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13250      +/-   ##
==========================================
- Coverage   89.66%   89.60%   -0.06%     
==========================================
  Files         257      257              
  Lines        7013     7013              
  Branches     1736     1736              
==========================================
- Hits         6288     6284       -4     
- Misses        380      384       +4     
  Partials      345      345              

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