Add web search and page viewing tools for code agent

[codegen-sh]

This PR adds web search and page viewing capabilities to the code agent, allowing it to access documentation and other online resources.

Changes

1. Created two new tool functions:

   • web_search.py: Implements a web search tool using the SerpAPI to search the web and return results
   • web_page_view.py: Implements a web page viewing tool to extract content from web pages

2. Added corresponding tool classes in tools.py:

   • WebSearchTool: Tool for searching the web
   • WebPageViewTool: Tool for viewing web page content

3. Updated agent creation functions to include the new tools:

   • Added tools to create_codebase_agent
   • Added tools to create_chat_agent
   • Added tools to get_workspace_tools

Usage

The web search tool requires a SERP_API_KEY environment variable to be set. Users can obtain a key from https://serpapi.com/.

Example usage:

# Search the web
web_search(query="python requests library documentation", num_results=5)

# View a web page
web_page_view(url="https://docs.python.org/3/library/requests.html", max_length=5000)

These tools enable the agent to look up documentation, tutorials, and other online resources to better assist developers.

Resolves: CG-12183

[CLAassistant]

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