- Integrate ObservationRegistry for instrumentation in VertexAiGeminiChatModel's non-streaming call
- Add ChatModelObservationContext and related classes for observation
- Refactor createGeminiRequest method to support runtime options for imperative calls
- Implement observation for non-streaming chat operations in VertexAiChatModelObservationIT
- Add VertexAiGeminiConstants class for provider name
This commit enhances the VertexAiGeminiChatModel with observability features
for the non-streaming, imperative call() method. It allows for better
monitoring and instrumentation of synchronous chat operations. The changes
include refactoring to improve runtime option handling for these calls and
adds integration tests for the new observability features.
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