opentelemetry-instrumentation-vertexai 2.1b0

[github-actions[bot]]

• Update instrumentation to use the latest semantic convention changes made in Using attributes for chat history on gen_ai spans and events semantic-conventions#2179. Now only a single event and span (gen_ai.client.inference.operation.details) are used to capture prompt and response content. These changes are opt-in, users will need to set the environment variable OTEL_SEMCONV_STABILITY_OPT_IN to gen_ai_latest_experimental to see them (#3799) and (#3709). Update instrumentation to call upload hook.
• Implement uninstrument for opentelemetry-instrumentation-vertexai (#3328)
• VertexAI support for async calling (#3386) - Migrate off the deprecated events API to use the logs API (#3625) - Update gen_ai_latest_experimental instrumentation to record files being passed to the model (#3840).

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This discussion was created from the release opentelemetry-instrumentation-vertexai 2.1b0.