Add OpenTelemetry lib and metric-interfaces#588

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maladetska wants to merge 7 commits intoydb-platform:mainfrom

maladetska:METRICS-0

Commits on Mar 24, 2026

init commit
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make metrics as client_component
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fixes
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add includes
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fixes and add metric tests
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metrics -> stats, TQuerySpan -> TOperationSpan, TQueryMetrics -> TOperationMetrics
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