[AI] Add configurable model generation for AI On-Device

[rlazo]

Introduced GenerationConfig, ModelConfig, ModelReleaseStage, and ModelPreference to firebase-ai-ondevice-interop to allow for configurable model selection.

Updated the internal genaiPrompt dependency to 1.0.0-beta2 to support the new configuration options.

Deprecated the parameter-less FirebaseAIOnDeviceGenerativeModelFactory.newGenerativeModel() method in favor of a new overload that accepts a GenerationConfig.

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[rlazo]

/gemini review

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Code Review

This pull request introduces configuration options for the on-device generative model by adding GenerationConfig and ModelConfig classes to the interop layer. It updates the FirebaseAIOnDeviceGenerativeModelFactory to support these configurations, deprecating the parameterless model creation method. Additionally, it includes converter functions to bridge interop and MLKit types and updates the genaiPrompt dependency version. Feedback was provided regarding incorrect ReplaceWith expressions in deprecation annotations and a minor inconsistency in KDoc documentation.