feat(Overlay): add teleport prop

[inottn]

resolve #13085

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.63%. Comparing base (867e612) to head (16a7e49). Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/vant/src/overlay/Overlay.tsx	80.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13087      +/-   ##
==========================================
- Coverage   89.66%   89.63%   -0.04%     
==========================================
  Files         257      257              
  Lines        6987     6992       +5     
  Branches     1724     1725       +1     
==========================================
+ Hits         6265     6267       +2     
- Misses        382      384       +2     
- Partials      340      341       +1     

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