Feature remove global config in the search/browser engine

[shenchucheng]

Features

• Replace parse_obj_as with TypeAdapter.validate_python
• Remove the global config in the search/browser engine
• Allow access to private_context when validating Action using the model_validator(mode="after") decorator
• Replace the __init__ method with model_validator in the WebBrowserEngine/SearchEngine/ContextMixin class to make it more annotation-friendly

Result

[codecov-commenter]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (9ecdccd) 85.25% compared to head (e246a9c) 84.50%.
Report is 1 commits behind head on dev.

Files	Patch %	Lines
metagpt/actions/search_and_summarize.py	22.22%	7 Missing ⚠️
metagpt/tools/search_engine.py	85.71%	6 Missing ⚠️
metagpt/roles/sales.py	44.44%	5 Missing ⚠️
metagpt/tools/search_engine_googleapi.py	76.19%	5 Missing ⚠️
metagpt/roles/searcher.py	60.00%	4 Missing ⚠️
metagpt/tools/search_engine_serpapi.py	76.92%	3 Missing ⚠️
metagpt/tools/search_engine_serper.py	78.57%	3 Missing ⚠️
metagpt/tools/web_browser_engine.py	92.30%	2 Missing ⚠️
metagpt/tools/web_browser_engine_playwright.py	88.23%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #820      +/-   ##
==========================================
- Coverage   85.25%   84.50%   -0.76%     
==========================================
  Files         186      186              
  Lines        9871     9934      +63     
==========================================
- Hits         8416     8395      -21     
- Misses       1455     1539      +84     

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[geekan]

update https://github.com/geekan/MetaGPT-docs/ is also needed.

[geekan]

LGTM