Update OpenTelemetry metrics dependencies

[shuheiktgw]

Summary

This PR aims to solve the same problem as #6465, but with a different approach. Instead of reimplementing the libraries ourselves, we are opening PRs to fix the issues upstream and patching them on our side until those PRs are merged and released.

• Update the OpenTelemetry crates to 0.32 and patch them with the SDK fix from fix(sdk): normalize metric attribute keys open-telemetry/opentelemetry-rust#3545.
• Use metrics-exporter-otel 0.3.2 and patch it with the fix from Bump metrics-exporter-otel to 0.3.2 palindrom615/metrics-exporter-otel#2 so that we can use OpenTelemetry 0.32.

[chatgpt-codex-connector]

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[Mallets]

I understand the patch on opentelemetry but why should your metrics fork be used here?

[shuheiktgw]

palindrom615/metrics-exporter-otel is a fork of metrics-rs/metrics, and I’ve already forked metrics-rs/metrics, so I can’t fork palindrom615/metrics-exporter-otel because GitHub doesn’t allow users to fork the same repo tree multiple times.

But I may just delete my metrics-rs/metrics fork and fork palindrom615/metrics-exporter-otel directly instead, which might simplify things here. Let me try 🙏