cybertec-postgresql / pg_timetable / 27978019326

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[!] add OpenTelemetry tracing and metrics support (#768)

* [!] add OpenTelemetry tracing and metrics support

- Add `OTelOpts` config struct
- Add `internal/otel` package: Provider, Tracer, Meter, Shutdown, Noop
- Add 5 metric instruments
- Instrument `executeChain` and `executeTask` with spans and metrics
- Wire real provider in `main.go` with graceful shutdown
- `ValidateOTel()` validates endpoint scheme, ratio, and timeouts
- Protocol auto-detected from URL scheme (grpc:// vs http(s)://)
- Headers are YAML-only (prevents secrets in shell history)
- Fallback to `Noop` provider on init failure

* improve test coverage

* update manual on quick start

238 of 269 new or added lines in 6 files covered. (88.48%)

2028 of 2261 relevant lines covered (89.69%)

1.02 hits per line