Problem
Web search tools may hang indefinitely without a timeout specified

In the implementation of the search-related tools in default_tools.py, the current use of requests.get can lead to an indefinite hang because the timeout parameter is not specified (except for the VisitWebpageTool which has a timeout of 20 seconds). (Reference: https://requests.readthedocs.io/en/latest/user/quickstart/#timeouts)

Suggested fix: Add a timeout parameter to the tools and pass it to the requests.get call so that users can control the timeout when creating the tools.

Checklist

• I have searched the existing issues and have not found a similar bug report.
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