feat(pro:search): searchField supports keywordFallback option

[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?

What is the new behavior?

新增 keywordFallback 选项
新增支持搜索项名称搜索输入在没有匹配到任何搜索项时回退使用某项搜索项进行搜索

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1698 (d59a1e0) into main (5259671) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head d59a1e0 differs from pull request most recent head 8913341. Consider uploading reports for the commit 8913341 to get more accurate results

@@           Coverage Diff           @@
##             main    #1698   +/-   ##
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  Coverage   92.54%   92.54%           
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  Files         345      345           
  Lines       32423    32423           
  Branches     2713     2713           
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  Hits        30007    30007           
  Misses       2416     2416           

Files	Coverage Δ
packages/components/select/src/token.ts	100.00% <100.00%> (ø)
packages/pro/locales/src/types.ts	100.00% <100.00%> (ø)