Add fractional search feature to ripgrep_search tool

[codegen-sh]

This PR adds a new fractional_search parameter to the ripgrep_search tool that enables automatic fallback to searching for individual words when a multi-word search returns no results.

Features

• Added a new boolean parameter fractional_search (default: False) to the search functions
• When enabled and a multi-word search returns no results, the system will:
  • Split the query into individual words
  • Search for each word separately (skipping very short words < 3 chars)
  • Combine the results while avoiding duplicates
  • Return the combined results as if they were from the original query
• Implemented for both the ripgrep and Python search implementations

Benefits

• Improves search experience by providing relevant results even when exact phrases aren't found
• Helps users find related code without having to manually try different search terms
• Maintains the original search behavior by default (opt-in feature)

Example Usage

# Search with automatic fallback to individual words
ripgrep_search(query="transaction date validation", fractional_search=True)

This addresses the request from Eduardo Pujol to implement a fractional search feature as a fallback mechanism when multi-word searches don't yield results.

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