Feature request: Support OpenTelemetry

[sc07kvm]

Since ClickHouse supports OpenTelemetry it would be cool to be able to transfer trace context in request similar to options
--opentelemetry-traceparent and --opentelemetry-tracestate in clickhouse-client

[xzkostyan]

Please explain a little bit more how do you see OpenTelemetry implementatioin in this package.

[sc07kvm]

I see OpenTelemetry implementatioin as options in settings of the clickhouse_driver.Client and clickhouse_driver.Client.execute[_iter|_with_progress]. These options will be passed to the server. Example:

>>> settings = {
    'opentelemetry_traceparent': '00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01', 
    'opentelemetry_tracestate': 'congo=t61rcWkgMzE'}
>>> client = Client('localhost', settings=settings)

Description of --opentelemetry-traceparent and --opentelemetry-tracestate can be found here:

clickhouse-client --help
...
  --opentelemetry-traceparent arg   OpenTelemetry traceparent header as described by W3C Trace Context recommendation
  --opentelemetry-tracestate arg    OpenTelemetry tracestate header as described by W3C Trace Context recommendation
...

[xzkostyan]

@sc07kvm I've added OpenTelemetry support to latest master. Looking forward to your feedback.