feat:Add raw_search output to OpenSearch multimodal component

[edwinjosechittilappilly]

Introduces a new 'raw_search' method and output to the OpenSearchVectorStoreComponentMultimodalMultiEmbedding class, allowing execution of arbitrary OpenSearch queries via a dictionary input. Also updates the component's inputs and outputs to support this functionality.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-add-run-query-opensearch

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