Add bing search engine to tools module

[bluechanel]

Features Add bing search engine to tools module

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 48.21429% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 81.19%. Comparing base (6450a09) to head (9793f08).

Files	Patch %	Lines
metagpt/tools/search_engine_bing.py	44.23%	29 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1120      +/-   ##
==========================================
- Coverage   81.33%   81.19%   -0.14%     
==========================================
  Files         251      252       +1     
  Lines       13980    14036      +56     
==========================================
+ Hits        11370    11397      +27     
- Misses       2610     2639      +29     

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