Add Support for gemini embeddings

[gshikhar2021]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request introduces support for the Gemini embedding model within the unstructured data pipeline. It expands the existing embedding configuration schema to include Gemini-specific parameters, updates the controller logic to dynamically select and apply configurations based on the chosen model, and ensures compatibility across the codebase including deepcopy methods and equality checks.

Highlights

• Gemini Embedding Support: Added configuration and logic to support the 'gemini-embedding-2' model for vector embedding generation.
• Controller Updates: Updated the vector embeddings controller to dynamically handle model-specific configurations and encoding formats.
• CRD and Schema Updates: Updated CRD definitions and sample files to include the new Gemini embedding configuration schema.

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[gemini-code-assist]

Code Review

This pull request adds support for the gemini-embedding-2 model to the vector embeddings generator, including configuration structs, CRD updates, and controller refactoring to dynamically initialize the embedding client. A critical issue was identified in vectorembeddingsgenerator_controller.go where accessing unstructuredSecret without checking if it is nil could lead to a nil pointer dereference and crash the operator if the controller reconciles before the secret is loaded into memory.

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[gemini-code-assist]

There is a potential nil pointer dereference here. unstructuredSecret is a package-level global variable initialized in ControllerConfigReconciler. If the operator restarts, VectorEmbeddingsGeneratorReconciler might reconcile before ControllerConfigReconciler has populated unstructuredSecret in memory (even if the CR status is 'Healthy' in etcd). This will cause a panic and crash the operator.

Please add a defensive check to ensure unstructuredSecret and its Data field are not nil before accessing them.

	if unstructuredSecret == nil || unstructuredSecret.Data == nil {
		return false, fmt.Errorf("unstructured secret is not initialized in memory")
	}

	endpoint = string(unstructuredSecret.Data[config.Endpoint])
	apiKey = string(unstructuredSecret.Data[config.APIKey])