Middlewares and tools to integrate tonic + tracing + opentelemetry.
Really early, missing lot of features, help is welcomed.
Read OpenTelemetry header from the incoming requests
Start a new trace if no trace is found in the incoming request
Trace is attached into tracing'span
TODO
layer for client
add test
add documentation
add examples
validate with [[opentelemetry-specification/rpc.md at main · open-telemetry/opentelemetry-specification · GitHub](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/rpc.md#grpc)]