feat: split EvaluationTrace into reason + error_code#319

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fabriziodemaria wants to merge 6 commits intomainfrom

feat/split-evaluation-trace-reason-error

Commits on Mar 19, 2026

feat: enhance telemetry with new metrics and evaluation tracing
fabriziodemaria
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style: fix google-java-format violations in Confidence.java
fabriziodemaria
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fix: pass telemetry param to ClientDelegate in ConfidenceStub
fabriziodemaria
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fix: wire telemetry into Confidence.create for test visibility
fabriziodemaria
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fix: pass telemetry to Confidence.create in FeatureProviderTest
fabriziodemaria
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fix: enhance telemetry tracking in ConfidenceFeatureProvider
fabriziodemaria
committed