feat(dialog): add new keyboardEnabled prop

[lzxiaoqi]

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#13164

针对issue #13164 提到的部分手机场景的某些操作会自动执行enter的键盘事件，新增keyboardEnabled属性来控制是否选择使用键盘能力选项

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.63%. Comparing base (379f44a) to head (d4c26dc).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/vant/src/dialog/Dialog.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13178      +/-   ##
==========================================
- Coverage   89.67%   89.63%   -0.04%     
==========================================
  Files         257      257              
  Lines        7004     7006       +2     
  Branches     1732     1733       +1     
==========================================
- Hits         6281     6280       -1     
- Misses        378      382       +4     
+ Partials      345      344       -1     

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[chenjiahan]

Thanks!