Add fractional search feature to ripgrep_search tool

[codegen-sh]

This PR adds a new fractional_search feature to the ripgrep_search tool. When enabled, this feature will automatically search for individual words from a query if the full query returns no results.

Changes:

1. Added a new fractional_search parameter to the search function in search.py (default: False)
2. Modified both _search_with_ripgrep and _search_with_python to implement the fractional search logic:
   • If no results are found for the full query and fractional_search=True:
     • Split the query into individual words (filtering out very short words)
     • Search for each word individually
     • Combine results while avoiding duplicates
3. Updated the SearchInput model to include the new parameter
4. Updated the RipGrepTool class to pass the parameter to the search function
5. Renamed the tool from "search" to "ripgrep_search" for clarity

This feature will help improve search results when exact phrases aren't found in the codebase, making it easier to discover relevant code without having to manually try different search terms.

Testing:

The implementation includes:

• Proper handling of duplicate results when combining individual word searches
• Skipping very short words (less than 3 characters) to avoid noise
• Maintaining the original search behavior when fractional_search is disabled
• Support for both ripgrep and Python-based search implementations

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