feat(opentelemetry source): allow to add headers to metadata for OpenTelemetry metrics and traces#24942

pront merged 18 commits intovectordotdev:mastervectordotdev/vector:masterfrom

ozanichkovsky:feature/opentelemetry-metrics-traces-headersozanichkovsky/vector:feature/opentelemetry-metrics-traces-headersCopy head branch name to clipboard