Search refactor + Community search

[prasmussen15]

:rocket:	This description was created by Ellipsis for commit 031ba12eeebf5f2d474e6c08dff15800dc6e7376

refactor: enhance search with modular configurations and community search support

Summary:

Refactor search functionality to support modular configurations and add community search capability in graphiti_core.

Key points:

• Refactor search logic in graphiti.py to use search() from search.py.
• Introduce SearchConfig, EdgeSearchConfig, NodeSearchConfig, CommunitySearchConfig in search_config.py.
• Add search_config_recipes.py for predefined search configurations.
• Add community search functionality in search.py and search_utils.py.
• Implement community_fulltext_search and community_similarity_search in search_utils.py.
• Add SearchRerankerError in errors.py for reranker configuration issues.
• Update test_graphiti_int.py to test new search configurations and community search.
• Add Apache License headers to multiple files.

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