OpenTelemetry-compatible metrics naming

[DifferentialOrange]

See Notion RFC (private) for more detailed info.

Provide a new naming policy for all metrics in tarantool/metrics based on OpenTelemetry naming guides. Implement a flag to enable new/old metrics naming policy through metrics.cfg{} . Implement metrics naming transformations in existing plugins where needed (like OTLP to Prometheus in OpenTelemetry C++ SDK).

OpenTelemetry provides a detailed guide on metrics naming [1].

1. https://opentelemetry.io/docs/reference/specification/metrics/semantic_conventions/

[DifferentialOrange]

Estimation includes

• proposing new name for each existing metric,
• proposing a small guide for naming new metrics,
• finalization and approval for all of the above with product team.

[github-actions]

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