Update to genai standard convention 1.37

[stephentoub]

https://github.com/open-telemetry/semantic-conventions/releases/tag/v1.37.0

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

This PR updates the OpenTelemetry instrumentation in Microsoft.Extensions.AI to conform to the latest 1.37.0 draft specification of the Semantic Conventions for Generative AI systems. The changes include updating tag names and replacing logging-based telemetry with activity tags for better structured data.

• Updated OpenTelemetry semantic conventions from v1.36 to v1.37
• Replaced logging-based telemetry with structured activity tags for messages
• Standardized provider-specific tag naming conventions

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
OpenTelemetryConsts.cs	Updated constant definitions to align with v1.37 conventions, added new message-related constants
OpenTelemetryChatClient.cs	Replaced logging with activity tags for message serialization and updated tag names
OpenTelemetryEmbeddingGenerator.cs	Updated tag names and variable naming to match new conventions
FunctionInvokingChatClient.cs	Updated to use constants for operation name and tool type
Test files	Updated test assertions to match new tag naming conventions
CHANGELOG.md	Added entry documenting the OpenTelemetry update

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