Export aggregated OTLP client operation metrics

[sfc-gh-dan]

Summary

• aggregate client operation success and failure outcomes and export delta counters/histograms to the OTLP /v1/metrics endpoint
• keep dimensions bounded to operation and outcome while preserving detailed failure logs and opt-in success diagnostic logs
• attach installed package version and client surface as resource attributes and send a versioned User-Agent
• derive the public package version from installed distribution metadata and document metric names and success semantics

This replaces per-success log volume with periodic aggregates while keeping the existing failure evidence needed for debugging.

Testing

• 503 tests passed: .venv/bin/python -m pytest tests/ -q

[snowflake-security-bot]

Snowflake Security Review

Security grade: A — Passed ✅

This PR was classified as LOW risk by the automated pre-screen.