otlp: Move otlptranslator package from prom/prom to here · prometheus/common@60d30e3

Lint: otlptranslator/prometheusremotewrite/helper_test.go#L323

Error return value of `converter.addSummaryDataPoints` is not checked (errcheck)

Lint: otlptranslator/prometheusremotewrite/helper_test.go#L434

Error return value of `converter.addHistogramDataPoints` is not checked (errcheck)

Lint: otlptranslator/prometheusremotewrite/number_data_points_test.go#L70

Error return value of `converter.addGaugeNumberDataPoints` is not checked (errcheck)

Lint: otlptranslator/prometheusremotewrite/number_data_points_test.go#L247

Error return value of `converter.addSumNumberDataPoints` is not checked (errcheck)

Lint: otlptranslator/prometheus/testutils_test.go#L26