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[prasmussen15]

[!IMPORTANT] Adds batch embedding support for nodes and edges, improving performance by reducing asynchronous calls.

• Behavior:
  • Introduces create_entity_edge_embeddings() in edges.py for batch embedding of EntityEdge objects.
  • Introduces create_entity_node_embeddings() in nodes.py for batch embedding of EntityNode objects.
  • Replaces individual embedding generation with batch embedding in extract_edges() in edge_operations.py and extract_nodes() in node_operations.py.
• Embedder Clients:
  • Adds create_batch() method to EmbedderClient in client.py.
  • Implements create_batch() in gemini.py, openai.py, and voyage.py for batch embedding support.
• Misc:
  • Removes unused parameter in get_relevant_edges() and get_relevant_nodes() calls in edge_operations.py and node_operations.py.

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