Add azure.ai.loom CLI support for Foundry experiment tracking APIs

[babu-namburi]

Add a standalone first-party azure.ai.loom extension for the Microsoft Foundry experiment-tracking data plane. The extension keeps the established azure.ai.projects surface unchanged and exposes all experiment operations under azd ai loom run.

CLI surfaces

Run inspection

• azd ai loom run list
• azd ai loom run history-keys --run-id <run-id>
• azd ai loom run summary --run-id <run-id>
• azd ai loom run metrics --run-id <run-id>
• azd ai loom run system-metrics --run-id <run-id> --name <metric>
• azd ai loom run logs --run-id <run-id>
• azd ai loom run log-records --run-id <run-id>
• azd ai loom run compare --run-id <first-run> --run-id <second-run> --metric <metric>

Traces and spans

• azd ai loom run trace list --run-id <run-id>
• azd ai loom run trace show --run-id <run-id> --trace-id <trace-id>
• azd ai loom run trace chat --run-id <run-id> --trace-id <trace-id>
• azd ai loom run span query --run-id <run-id>

Span queries support inline filters (--filter), filter files (--filter-file), complete request bodies (--request-file), detailed results (--include-details), and result limits (--limit).

OpenTelemetry ingestion

• azd ai loom run ingest metrics --run-id <run-id> --file <metrics.pb>
• azd ai loom run ingest logs --run-id <run-id> --file <logs.pb>
• azd ai loom run ingest traces --run-id <run-id> --file <traces.pb>
• azd ai loom run ingest agent-traces --run-id <run-id> --file <agent-traces.json>

OTLP metrics, logs, and traces accept protobuf payloads. Agent traces accept JSON. All ingestion commands support --file - for stdin and reject empty payloads.

W&B compatibility

• azd ai loom run wandb graphql --file <request.json>
• azd ai loom run wandb file-stream --run-id <run-id> --file <request.json>

Shared behavior

• Resolve the project endpoint from --project-endpoint, the active azd environment, compatible azure.ai.projects context, or host environment variables.
• Allow Loom to run independently of the azure.ai.projects extension.
• Derive the project ID from /api/projects/{projectId}, with --project-id override support.
• Default to Microsoft Entra bearer authentication using https://ai.azure.com/.default.
• Support AZURE_AI_PROJECT_API_KEY as an explicit project data-plane authentication override.
• Support --api-version overrides.
• Emit complete JSON responses for automation.
• Preserve escaped path identifiers and large JSON numbers in request files.
• Include unit tests, extension build/release wiring, and usage documentation.

Implemented by #9795. Official extension-registry publication will follow the normal release handoff.