Add cloud.provider semantic conventions (#1865)
Add cloud.provider semantic conventions (#1865)

See https://github.com/open-telemetry/opentelemetry-specification/pull/1018
open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector