feat(pro:search): temp state is now cleared after blur, add merge items demo

[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?

失去焦点时保留正在编辑的搜索条件

What is the new behavior?

不再保留，失焦后重置
补充合并多个同类搜索项的demo

Other information

设计师需求补充

[idux-bot]

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[codecov]

Codecov Report

Merging #1253 (807770a) into main (f3aa234) will not change coverage.
The diff coverage is n/a.

❗ Current head 807770a differs from pull request most recent head 6a3916a. Consider uploading reports for the commit 6a3916a to get more accurate results

@@           Coverage Diff           @@
##             main    #1253   +/-   ##
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  Coverage   93.05%   93.05%           
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  Files         320      320           
  Lines       29448    29448           
  Branches     3339     3339           
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  Hits        27403    27403           
  Misses       2045     2045           

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